Copilot commented on code in PR #12900:
URL: https://github.com/apache/gravitino/pull/12900#discussion_r4255360773


##########
web-v2/web/src/app/catalogs/rightContent/CreateSemanticModelDialog.js:
##########
@@ -0,0 +1,279 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *  http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+'use client'
+
+import React, { useEffect, useRef, useState } from 'react'
+import { Form, Input, Modal, Spin, Typography } from 'antd'
+import { useScrolling } from 'react-use'
+import RenderPropertiesFormItem from '@/components/EntityPropertiesFormItem'
+import { validateMessages, dialogContentMaxHeigth, mismatchName } from 
'@/config'
+import { nameRegex } from '@/lib/utils/regex'
+import { useResetFormOnCloseModal } from '@/lib/hooks/use-reset'
+import { cn } from '@/lib/utils/tailwind'
+import { useAppDispatch } from '@/lib/hooks/useStore'
+import {
+  formatSemanticModelDefinition,
+  genSemanticModelUpdates,
+  parseSemanticModelDefinition
+} from '@/lib/utils/semanticModel'
+import { createSemanticModel, updateSemanticModel, getSemanticModelDetails } 
from '@/lib/store/metalakes'
+
+const { Paragraph } = Typography
+const { TextArea } = Input
+
+const definitionPlaceholder = `{
+  "datasets": [
+    {
+      "name": "orders",
+      "source": { "namespace": ["sales", "mart"], "name": "orders" },
+      "fields": []
+    }
+  ]
+}`
+
+const defaultValues = {
+  name: '',
+  comment: '',
+  definition: '',
+  properties: []
+}
+
+export default function CreateSemanticModelDialog({ ...props }) {
+  const { open, setOpen, metalake, catalog, schema, editSemanticModel, onSaved 
} = props
+  const [confirmLoading, setConfirmLoading] = useState(false)
+  const [isLoading, setIsLoading] = useState(false)
+  const [cacheData, setCacheData] = useState()
+  const scrollRef = useRef(null)
+  const loadedRef = useRef(false)
+  const scrolling = useScrolling(scrollRef)
+  const [bottomShadow, setBottomShadow] = useState(false)
+  const [topShadow, setTopShadow] = useState(false)
+  const [form] = Form.useForm()
+  const dispatch = useAppDispatch()
+
+  useResetFormOnCloseModal({
+    form,
+    open
+  })
+
+  const handScroll = () => {
+    if (scrollRef.current) {
+      const { scrollTop, scrollHeight, clientHeight } = scrollRef.current
+      if (scrollHeight > clientHeight + scrollTop) {
+        setTopShadow(true)
+        setBottomShadow(scrollTop > 0)
+      } else if (scrollHeight === clientHeight + scrollTop) {
+        setTopShadow(false)
+        setBottomShadow(scrollTop > 0)
+      }
+    }
+  }
+
+  useEffect(() => {
+    scrollRef.current && handScroll()
+  }, [scrolling])
+
+  useEffect(() => {
+    if (open && editSemanticModel && !loadedRef.current) {
+      loadedRef.current = true
+
+      const initLoad = async () => {
+        setIsLoading(true)
+        try {
+          const { payload } = await dispatch(
+            getSemanticModelDetails({ metalake, catalog, schema, 
semanticModel: editSemanticModel })
+          )
+          const loaded = payload?.semanticModel
+          setCacheData(loaded)
+          form.setFieldValue('name', loaded?.name)
+          form.setFieldValue('comment', loaded?.comment)
+          form.setFieldValue('definition', 
formatSemanticModelDefinition(loaded?.definition))
+          let index = 0
+          Object.entries(loaded?.properties || {}).forEach(([key, value]) => {
+            form.setFieldValue(['properties', index, 'key'], key)
+            form.setFieldValue(['properties', index, 'value'], value)
+            index++
+          })
+          setIsLoading(false)
+        } catch (e) {
+          setIsLoading(false)
+        }
+      }
+      initLoad()
+    }
+
+    // Reset loadedRef when dialog closes
+    if (!open) {
+      loadedRef.current = false
+    }
+  }, [open, editSemanticModel, metalake, catalog, schema])
+
+  const validateDefinition = (rule, value) => {
+    const { errors } = parseSemanticModelDefinition(value)
+
+    return errors.length
+      ? Promise.reject(
+          <ul className='list-disc pl-4'>
+            {errors.map(error => (
+              <li key={error}>{error}</li>
+            ))}
+          </ul>
+        )
+      : Promise.resolve()
+  }
+
+  const handleSubmit = e => {
+    e.preventDefault()
+    form
+      .validateFields()
+      .then(async values => {
+        const { definition } = parseSemanticModelDefinition(values.definition)
+
+        setConfirmLoading(true)
+
+        const submitData = {
+          name: values.name.trim(),
+          comment: values.comment,
+          definition,
+          properties: Object.fromEntries((values.properties || []).map(({ key, 
value }) => [key, value]))
+        }
+
+        let result
+        if (editSemanticModel) {
+          const updates = genSemanticModelUpdates(cacheData, submitData)
+          if (updates.length) {
+            result = await dispatch(
+              updateSemanticModel({
+                metalake,
+                catalog,
+                schema,
+                semanticModel: editSemanticModel,
+                data: { updates }
+              })
+            )
+          }
+        } else {
+          result = await dispatch(createSemanticModel({ data: submitData, 
metalake, catalog, schema }))
+        }
+
+        if (!result?.payload?.err && !result?.error) {
+          setOpen(false)
+          if (result) await onSaved?.(result.payload)
+        }
+      })
+      .catch(info => {
+        if (info?.errorFields?.length) {
+          form.scrollToField(info.errorFields[0].name)
+        } else {
+          console.error(info)
+        }
+      })
+      .finally(() => setConfirmLoading(false))
+  }
+
+  const handleCancel = () => {
+    setOpen(false)
+  }
+
+  return (
+    <>
+      <Modal
+        title={!editSemanticModel ? 'Create Semantic Model' : 'Edit Semantic 
Model'}
+        open={open}
+        onOk={handleSubmit}
+        okText='Submit'
+        okButtonProps={{
+          'data-refer': 'handle-submit-semantic-model',
+          disabled: isLoading || (!!editSemanticModel && !cacheData)
+        }}
+        maskClosable={false}
+        keyboard={false}
+        width={800}
+        confirmLoading={confirmLoading}
+        onCancel={handleCancel}
+      >
+        <Paragraph type='secondary'>
+          {!editSemanticModel
+            ? 'Create a new semantic model.'
+            : `Edit the semantic model ${editSemanticModel}. The definition is 
replaced as a whole.`}
+        </Paragraph>
+        <div
+          className={cn('relative', {
+            'after:absolute after:-bottom-10 after:left-0 after:right-0 
after:h-10 after:shadow-[0px_-10px_8px_-8px_rgba(5,5,5,0.1)]':
+              topShadow,
+            'before:absolute before:-top-10 before:left-0 before:right-0 
before:h-10 before:z-10 before:shadow-[0px_10px_8px_-8px_rgba(5,5,5,0.1)]':
+              bottomShadow
+          })}
+        >
+          <div className='overflow-auto' style={{ maxHeight: 
`${dialogContentMaxHeigth}px` }} ref={scrollRef}>
+            <Spin spinning={isLoading}>
+              <Form
+                form={form}
+                initialValues={defaultValues}
+                layout='vertical'
+                name='semanticModelForm'
+                validateMessages={validateMessages}
+              >
+                <Form.Item
+                  name='name'
+                  label='Semantic Model Name'
+                  rules={[{ required: true }, { type: 'string', max: 64 }, { 
pattern: new RegExp(nameRegex) }]}

Review Comment:
   The literal model name `ossie` passes this rule, but 
`/semantic-models/ossie` is reserved by `SemanticModelOperations` for OSSIE 
import and shadows the native `/{semanticModel}` CRUD route. Creating or 
renaming to this value leaves the model listed but not loadable through this 
UI. Reject `ossie` in this shared create/edit name rule.



##########
web-v2/web/src/app/catalogs/rightContent/entitiesContent/SemanticModelDetailsPage.js:
##########
@@ -0,0 +1,575 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *  http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+'use client'
+
+import { useMemo, useState } from 'react'
+import { Button, Divider, Flex, Popover, Space, Spin, Table, Tabs, Tag, 
Tooltip, Typography, message } from 'antd'
+import { useAntdColumnResize } from 'react-antd-column-resize'
+import useResizeObserver from 'use-resize-observer'
+import { useRouter, useSearchParams } from 'next/navigation'
+import Tags from '@/components/CustomTags'
+import GetOwner from '@/components/GetOwner'
+import Icons from '@/components/Icons'
+import PropertiesContent from '@/components/PropertiesContent'
+import { useAppDispatch, useAppSelector } from '@/lib/hooks/useStore'
+import { getSemanticModelDetails } from '@/lib/store/metalakes'
+import { copyToClipboard } from '@/lib/utils'
+import { formatToDateTime, isValidDate } from '@/lib/utils/date'
+import { formatSemanticModelDefinition } from '@/lib/utils/semanticModel'
+import SemanticModelAIContext from './SemanticModelAIContext'
+import SemanticModelExport from './SemanticModelExport'
+import SemanticModelExtensions from './SemanticModelExtensions'
+import CreateSemanticModelDialog from '../CreateSemanticModelDialog'
+
+const { Title, Paragraph } = Typography
+
+const sourceFullName = source => {
+  if (!source) {
+    return '-'
+  }
+
+  return [...(source.namespace || []), source.name].filter(Boolean).join('.')
+}
+
+const renderExpression = expression => {
+  const dialects = expression?.dialects || []
+
+  if (!dialects.length) {
+    return <span>-</span>
+  }
+
+  return (
+    <Space direction='vertical' size={2}>
+      {dialects.map((dialect, index) => (
+        <span key={`${dialect?.dialect}-${index}`}>
+          <Tag>{dialect?.dialect}</Tag>
+          <span className='font-mono text-xs'>{dialect?.expression}</span>
+        </span>
+      ))}
+    </Space>
+  )
+}
+
+const renderColumns = columns => <span className='font-mono text-xs'>{(columns 
|| []).join(', ') || '-'}</span>
+
+const hasMetadata = entity => !!entity.aiContext || 
entity.customExtensions?.length > 0
+
+const renderMetadata = (entity, label) => (
+  <>
+    <SemanticModelAIContext context={entity?.aiContext} label={`${label} AI 
Context`} />
+    <SemanticModelExtensions extensions={entity?.customExtensions} 
label={`${label} Vendor Extensions`} />
+  </>
+)
+
+export default function SemanticModelDetailsPage() {
+  const searchParams = useSearchParams()
+  const router = useRouter()
+  const dispatch = useAppDispatch()
+  const metalake = searchParams.get('metalake')
+  const catalog = searchParams.get('catalog')
+  const schema = searchParams.get('schema')
+  const semanticModelName = searchParams.get('semanticModel')
+  const auth = useAppSelector(state => state.auth)
+  const { anthEnable } = auth
+  const store = useAppSelector(state => state.metalakes)
+  const semanticModel = store.activatedDetails
+  const [tabKey, setTabKey] = useState('Datasets')
+  const [openEdit, setOpenEdit] = useState(false)
+  const { ref, width } = useResizeObserver()
+
+  const definition = semanticModel?.definition
+  const properties = semanticModel?.properties
+  const createdAt = semanticModel?.audit?.createTime
+  const createdAtText = !createdAt || !isValidDate(createdAt) ? '-' : 
formatToDateTime(createdAt)
+  const lastModifiedAt = semanticModel?.audit?.lastModifiedTime
+  const lastModifiedText = !lastModifiedAt || !isValidDate(lastModifiedAt) ? 
'-' : formatToDateTime(lastModifiedAt)
+  const metadataObjectFullName = `${catalog}.${schema}.${semanticModelName}`
+
+  const datasets = useMemo(
+    () => (definition?.datasets || []).map(dataset => ({ ...dataset, key: 
dataset.name })),
+    [definition]
+  )
+
+  const relationships = useMemo(
+    () => (definition?.relationships || []).map(relationship => ({ 
...relationship, key: relationship.name })),
+    [definition]
+  )
+
+  const metrics = useMemo(
+    () => (definition?.metrics || []).map(metric => ({ ...metric, key: 
metric.name })),
+    [definition]
+  )
+
+  const definitionText = useMemo(() => 
formatSemanticModelDefinition(definition), [definition])
+
+  const tagContent = (
+    <div>
+      <Tags readOnly={true} metadataObjectType={'semantic_model'} 
metadataObjectFullName={metadataObjectFullName} />
+    </div>
+  )
+
+  const propertyContent = <PropertiesContent properties={properties} />
+
+  const onSaved = async updated => {
+    if (updated.name !== semanticModelName) {
+      const params = new URLSearchParams(searchParams.toString())
+      params.set('semanticModel', updated.name)
+      router.replace(`/catalogs?${params.toString()}`)
+    } else {
+      await dispatch(getSemanticModelDetails({ metalake, catalog, schema, 
semanticModel: updated.name, init: true }))
+    }
+  }
+
+  const onCopyDefinition = async () => {
+    try {
+      await copyToClipboard(definitionText)
+      message.success('Definition copied!')
+    } catch (err) {
+      console.error('Failed to copy definition: ', err)
+      message.error('Failed to copy definition')
+    }
+  }
+
+  const datasetColumns = useMemo(
+    () => [
+      {
+        title: 'Dataset Name',
+        dataIndex: 'name',
+        key: 'name',
+        width: 200,
+        ellipsis: true,
+        sorter: (a, b) => 
a.name.toLowerCase().localeCompare(b.name.toLowerCase())
+      },
+      {
+        title: 'Source',
+        dataIndex: 'source',
+        key: 'source',
+        width: 260,
+        ellipsis: true,
+        render: source => <span className='font-mono 
text-xs'>{sourceFullName(source)}</span>
+      },
+      {
+        title: 'Primary Key',
+        dataIndex: 'primaryKey',
+        key: 'primaryKey',
+        width: 180,
+        ellipsis: true,
+        render: renderColumns
+      },
+      {
+        title: 'Unique Keys',
+        dataIndex: 'uniqueKeys',
+        key: 'uniqueKeys',
+        width: 220,
+        render: keys =>
+          keys?.length ? (
+            <Space direction='vertical' size={4}>
+              {keys.map((columns, index) => (
+                <Tag key={index}>{renderColumns(columns)}</Tag>
+              ))}
+            </Space>
+          ) : (
+            <span>-</span>
+          )
+      },
+      {
+        title: 'Fields',
+        dataIndex: 'fields',
+        key: 'fields',
+        width: 80,
+        render: fields => <span>{(fields || []).length}</span>
+      },
+      {
+        title: 'Description',
+        dataIndex: 'description',
+        key: 'description',
+        ellipsis: true,
+        render: description => <span>{description || '-'}</span>
+      }
+    ],
+    []
+  )
+
+  const fieldColumns = useMemo(
+    () => [
+      {
+        title: 'Field Name',
+        dataIndex: 'name',
+        key: 'name',
+        width: 220,
+        render: (name, field) => (
+          <div className='break-words'>
+            <div>{name}</div>
+            {field.label && <Typography.Text 
type='secondary'>{field.label}</Typography.Text>}
+          </div>
+        )
+      },
+      {
+        title: 'Data Type',
+        dataIndex: 'datatype',
+        key: 'datatype',
+        width: 140,
+        render: datatype => (datatype ? <Tag>{datatype}</Tag> : <span>-</span>)
+      },
+      {
+        title: 'Time Dimension',
+        dataIndex: 'dimension',
+        key: 'dimension',
+        width: 140,
+        render: dimension => <span>{dimension?.isTime ? 'Yes' : 'No'}</span>
+      },
+      {
+        title: 'Expression',
+        dataIndex: 'expression',
+        key: 'expression',
+        render: renderExpression
+      },
+      {
+        title: 'Description',
+        dataIndex: 'description',
+        key: 'description',
+        ellipsis: true,
+        render: description => <span>{description || '-'}</span>
+      }
+    ],
+    []
+  )
+
+  const relationshipColumns = useMemo(
+    () => [
+      {
+        title: 'Relationship Name',
+        dataIndex: 'name',
+        key: 'name',
+        width: 220,
+        ellipsis: true,
+        sorter: (a, b) => 
a.name.toLowerCase().localeCompare(b.name.toLowerCase())
+      },
+      { title: 'From', dataIndex: 'from', key: 'from', width: 160, ellipsis: 
true },
+      {
+        title: 'From Columns',
+        dataIndex: 'fromColumns',
+        key: 'fromColumns',
+        width: 200,
+        ellipsis: true,
+        render: renderColumns
+      },
+      { title: 'To', dataIndex: 'to', key: 'to', width: 160, ellipsis: true },
+      {
+        title: 'To Columns',
+        dataIndex: 'toColumns',
+        key: 'toColumns',
+        ellipsis: true,
+        render: renderColumns
+      }
+    ],
+    []
+  )
+
+  const metricColumns = useMemo(
+    () => [
+      {
+        title: 'Metric Name',
+        dataIndex: 'name',
+        key: 'name',
+        width: 200,
+        ellipsis: true,
+        sorter: (a, b) => 
a.name.toLowerCase().localeCompare(b.name.toLowerCase())
+      },
+      {
+        title: 'Data Type',
+        dataIndex: 'datatype',
+        key: 'datatype',
+        width: 140,
+        render: datatype => (datatype ? <Tag>{datatype}</Tag> : <span>-</span>)
+      },
+      {
+        title: 'Expression',
+        dataIndex: 'expression',
+        key: 'expression',
+        render: renderExpression
+      },
+      {
+        title: 'Description',
+        dataIndex: 'description',
+        key: 'description',
+        ellipsis: true,
+        render: description => <span>{description || '-'}</span>
+      }
+    ],
+    []
+  )
+
+  const tabOptions = [
+    { label: 'Datasets', key: 'Datasets' },
+    { label: 'Relationships', key: 'Relationships' },
+    { label: 'Metrics', key: 'Metrics' },
+    { label: 'Definition', key: 'Definition' }
+  ]
+
+  const {
+    resizableColumns: datasetResizableColumns,
+    components: datasetComponents,
+    tableWidth: datasetTableWidth
+  } = useAntdColumnResize(() => {
+    return { columns: datasetColumns, minWidth: 100 }
+  }, [datasetColumns])
+
+  const {
+    resizableColumns: relationshipResizableColumns,
+    components: relationshipComponents,
+    tableWidth: relationshipTableWidth
+  } = useAntdColumnResize(() => {
+    return { columns: relationshipColumns, minWidth: 100 }
+  }, [relationshipColumns])
+
+  const {
+    resizableColumns: metricResizableColumns,
+    components: metricComponents,
+    tableWidth: metricTableWidth
+  } = useAntdColumnResize(() => {
+    return { columns: metricColumns, minWidth: 100 }
+  }, [metricColumns])
+
+  const expandedFieldsRow = dataset => (
+    <div>
+      {renderMetadata(dataset, dataset.name)}
+      <Table
+        data-refer='semantic-model-fields-grid'
+        size='small'
+        rowKey={field => field.name}
+        dataSource={dataset.fields || []}
+        columns={fieldColumns}
+        pagination={false}
+        expandable={{
+          expandedRowRender: field => renderMetadata(field, field.name),
+          rowExpandable: hasMetadata
+        }}
+      />
+    </div>
+  )
+
+  return (
+    <>
+      <Spin spinning={store.activatedDetailsLoading}>
+        <Flex className='mb-2' gap='small' align='flex-start' ref={ref}>
+          <div className='size-8'>
+            <Icons.iconify icon='mdi:graph-outline' className='my-icon-large' 
/>
+          </div>
+          <div className='grow-1 relative bottom-1'>
+            <Title level={3} style={{ marginBottom: '0.125rem' }}>
+              <Space>
+                <span
+                  title={semanticModelName}
+                  className='min-w-10 truncate'
+                  style={{ maxWidth: `calc(${width}px - 90px)`, display: 
'inherit' }}
+                >
+                  {decodeURIComponent(semanticModelName || '')}

Review Comment:
   `useSearchParams().get()` already returns the decoded query value, so 
decoding it again corrupts names containing percent escapes (for example, a 
literal `sales%20model` is displayed as `sales model`) and a valid imported 
name containing a lone `%` throws `URIError`, crashing the detail page. Render 
`semanticModelName` directly.



##########
web-v2/web/src/app/catalogs/rightContent/entitiesContent/SemanticModelDetailsPage.js:
##########
@@ -0,0 +1,575 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *  http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+'use client'
+
+import { useMemo, useState } from 'react'
+import { Button, Divider, Flex, Popover, Space, Spin, Table, Tabs, Tag, 
Tooltip, Typography, message } from 'antd'
+import { useAntdColumnResize } from 'react-antd-column-resize'
+import useResizeObserver from 'use-resize-observer'
+import { useRouter, useSearchParams } from 'next/navigation'
+import Tags from '@/components/CustomTags'
+import GetOwner from '@/components/GetOwner'
+import Icons from '@/components/Icons'
+import PropertiesContent from '@/components/PropertiesContent'
+import { useAppDispatch, useAppSelector } from '@/lib/hooks/useStore'
+import { getSemanticModelDetails } from '@/lib/store/metalakes'
+import { copyToClipboard } from '@/lib/utils'
+import { formatToDateTime, isValidDate } from '@/lib/utils/date'
+import { formatSemanticModelDefinition } from '@/lib/utils/semanticModel'
+import SemanticModelAIContext from './SemanticModelAIContext'
+import SemanticModelExport from './SemanticModelExport'
+import SemanticModelExtensions from './SemanticModelExtensions'
+import CreateSemanticModelDialog from '../CreateSemanticModelDialog'
+
+const { Title, Paragraph } = Typography
+
+const sourceFullName = source => {
+  if (!source) {
+    return '-'
+  }
+
+  return [...(source.namespace || []), source.name].filter(Boolean).join('.')
+}
+
+const renderExpression = expression => {
+  const dialects = expression?.dialects || []
+
+  if (!dialects.length) {
+    return <span>-</span>
+  }
+
+  return (
+    <Space direction='vertical' size={2}>
+      {dialects.map((dialect, index) => (
+        <span key={`${dialect?.dialect}-${index}`}>
+          <Tag>{dialect?.dialect}</Tag>
+          <span className='font-mono text-xs'>{dialect?.expression}</span>
+        </span>
+      ))}
+    </Space>
+  )
+}
+
+const renderColumns = columns => <span className='font-mono text-xs'>{(columns 
|| []).join(', ') || '-'}</span>
+
+const hasMetadata = entity => !!entity.aiContext || 
entity.customExtensions?.length > 0
+
+const renderMetadata = (entity, label) => (
+  <>
+    <SemanticModelAIContext context={entity?.aiContext} label={`${label} AI 
Context`} />
+    <SemanticModelExtensions extensions={entity?.customExtensions} 
label={`${label} Vendor Extensions`} />
+  </>
+)
+
+export default function SemanticModelDetailsPage() {
+  const searchParams = useSearchParams()
+  const router = useRouter()
+  const dispatch = useAppDispatch()
+  const metalake = searchParams.get('metalake')
+  const catalog = searchParams.get('catalog')
+  const schema = searchParams.get('schema')
+  const semanticModelName = searchParams.get('semanticModel')
+  const auth = useAppSelector(state => state.auth)
+  const { anthEnable } = auth
+  const store = useAppSelector(state => state.metalakes)
+  const semanticModel = store.activatedDetails
+  const [tabKey, setTabKey] = useState('Datasets')
+  const [openEdit, setOpenEdit] = useState(false)
+  const { ref, width } = useResizeObserver()
+
+  const definition = semanticModel?.definition
+  const properties = semanticModel?.properties
+  const createdAt = semanticModel?.audit?.createTime
+  const createdAtText = !createdAt || !isValidDate(createdAt) ? '-' : 
formatToDateTime(createdAt)
+  const lastModifiedAt = semanticModel?.audit?.lastModifiedTime
+  const lastModifiedText = !lastModifiedAt || !isValidDate(lastModifiedAt) ? 
'-' : formatToDateTime(lastModifiedAt)
+  const metadataObjectFullName = `${catalog}.${schema}.${semanticModelName}`
+
+  const datasets = useMemo(
+    () => (definition?.datasets || []).map(dataset => ({ ...dataset, key: 
dataset.name })),
+    [definition]
+  )
+
+  const relationships = useMemo(
+    () => (definition?.relationships || []).map(relationship => ({ 
...relationship, key: relationship.name })),
+    [definition]
+  )
+
+  const metrics = useMemo(
+    () => (definition?.metrics || []).map(metric => ({ ...metric, key: 
metric.name })),
+    [definition]
+  )
+
+  const definitionText = useMemo(() => 
formatSemanticModelDefinition(definition), [definition])
+
+  const tagContent = (
+    <div>
+      <Tags readOnly={true} metadataObjectType={'semantic_model'} 
metadataObjectFullName={metadataObjectFullName} />
+    </div>
+  )
+
+  const propertyContent = <PropertiesContent properties={properties} />
+
+  const onSaved = async updated => {
+    if (updated.name !== semanticModelName) {
+      const params = new URLSearchParams(searchParams.toString())
+      params.set('semanticModel', updated.name)
+      router.replace(`/catalogs?${params.toString()}`)
+    } else {
+      await dispatch(getSemanticModelDetails({ metalake, catalog, schema, 
semanticModel: updated.name, init: true }))
+    }
+  }
+
+  const onCopyDefinition = async () => {
+    try {
+      await copyToClipboard(definitionText)
+      message.success('Definition copied!')
+    } catch (err) {
+      console.error('Failed to copy definition: ', err)
+      message.error('Failed to copy definition')
+    }
+  }
+
+  const datasetColumns = useMemo(
+    () => [
+      {
+        title: 'Dataset Name',
+        dataIndex: 'name',
+        key: 'name',
+        width: 200,
+        ellipsis: true,
+        sorter: (a, b) => 
a.name.toLowerCase().localeCompare(b.name.toLowerCase())
+      },
+      {
+        title: 'Source',
+        dataIndex: 'source',
+        key: 'source',
+        width: 260,
+        ellipsis: true,
+        render: source => <span className='font-mono 
text-xs'>{sourceFullName(source)}</span>
+      },
+      {
+        title: 'Primary Key',
+        dataIndex: 'primaryKey',
+        key: 'primaryKey',
+        width: 180,
+        ellipsis: true,
+        render: renderColumns
+      },
+      {
+        title: 'Unique Keys',
+        dataIndex: 'uniqueKeys',
+        key: 'uniqueKeys',
+        width: 220,
+        render: keys =>
+          keys?.length ? (
+            <Space direction='vertical' size={4}>
+              {keys.map((columns, index) => (
+                <Tag key={index}>{renderColumns(columns)}</Tag>
+              ))}
+            </Space>
+          ) : (
+            <span>-</span>
+          )
+      },
+      {
+        title: 'Fields',
+        dataIndex: 'fields',
+        key: 'fields',
+        width: 80,
+        render: fields => <span>{(fields || []).length}</span>
+      },
+      {
+        title: 'Description',
+        dataIndex: 'description',
+        key: 'description',
+        ellipsis: true,
+        render: description => <span>{description || '-'}</span>
+      }
+    ],
+    []
+  )
+
+  const fieldColumns = useMemo(
+    () => [
+      {
+        title: 'Field Name',
+        dataIndex: 'name',
+        key: 'name',
+        width: 220,
+        render: (name, field) => (
+          <div className='break-words'>
+            <div>{name}</div>
+            {field.label && <Typography.Text 
type='secondary'>{field.label}</Typography.Text>}
+          </div>
+        )
+      },
+      {
+        title: 'Data Type',
+        dataIndex: 'datatype',
+        key: 'datatype',
+        width: 140,
+        render: datatype => (datatype ? <Tag>{datatype}</Tag> : <span>-</span>)
+      },
+      {
+        title: 'Time Dimension',
+        dataIndex: 'dimension',
+        key: 'dimension',
+        width: 140,
+        render: dimension => <span>{dimension?.isTime ? 'Yes' : 'No'}</span>
+      },
+      {
+        title: 'Expression',
+        dataIndex: 'expression',
+        key: 'expression',
+        render: renderExpression
+      },
+      {
+        title: 'Description',
+        dataIndex: 'description',
+        key: 'description',
+        ellipsis: true,
+        render: description => <span>{description || '-'}</span>
+      }
+    ],
+    []
+  )
+
+  const relationshipColumns = useMemo(
+    () => [
+      {
+        title: 'Relationship Name',
+        dataIndex: 'name',
+        key: 'name',
+        width: 220,
+        ellipsis: true,
+        sorter: (a, b) => 
a.name.toLowerCase().localeCompare(b.name.toLowerCase())
+      },
+      { title: 'From', dataIndex: 'from', key: 'from', width: 160, ellipsis: 
true },
+      {
+        title: 'From Columns',
+        dataIndex: 'fromColumns',
+        key: 'fromColumns',
+        width: 200,
+        ellipsis: true,
+        render: renderColumns
+      },
+      { title: 'To', dataIndex: 'to', key: 'to', width: 160, ellipsis: true },
+      {
+        title: 'To Columns',
+        dataIndex: 'toColumns',
+        key: 'toColumns',
+        ellipsis: true,
+        render: renderColumns
+      }
+    ],
+    []
+  )
+
+  const metricColumns = useMemo(
+    () => [
+      {
+        title: 'Metric Name',
+        dataIndex: 'name',
+        key: 'name',
+        width: 200,
+        ellipsis: true,
+        sorter: (a, b) => 
a.name.toLowerCase().localeCompare(b.name.toLowerCase())
+      },
+      {
+        title: 'Data Type',
+        dataIndex: 'datatype',
+        key: 'datatype',
+        width: 140,
+        render: datatype => (datatype ? <Tag>{datatype}</Tag> : <span>-</span>)
+      },
+      {
+        title: 'Expression',
+        dataIndex: 'expression',
+        key: 'expression',
+        render: renderExpression
+      },
+      {
+        title: 'Description',
+        dataIndex: 'description',
+        key: 'description',
+        ellipsis: true,
+        render: description => <span>{description || '-'}</span>
+      }
+    ],
+    []
+  )
+
+  const tabOptions = [
+    { label: 'Datasets', key: 'Datasets' },
+    { label: 'Relationships', key: 'Relationships' },
+    { label: 'Metrics', key: 'Metrics' },
+    { label: 'Definition', key: 'Definition' }
+  ]
+
+  const {
+    resizableColumns: datasetResizableColumns,
+    components: datasetComponents,
+    tableWidth: datasetTableWidth
+  } = useAntdColumnResize(() => {
+    return { columns: datasetColumns, minWidth: 100 }
+  }, [datasetColumns])
+
+  const {
+    resizableColumns: relationshipResizableColumns,
+    components: relationshipComponents,
+    tableWidth: relationshipTableWidth
+  } = useAntdColumnResize(() => {
+    return { columns: relationshipColumns, minWidth: 100 }
+  }, [relationshipColumns])
+
+  const {
+    resizableColumns: metricResizableColumns,
+    components: metricComponents,
+    tableWidth: metricTableWidth
+  } = useAntdColumnResize(() => {
+    return { columns: metricColumns, minWidth: 100 }
+  }, [metricColumns])
+
+  const expandedFieldsRow = dataset => (
+    <div>
+      {renderMetadata(dataset, dataset.name)}
+      <Table
+        data-refer='semantic-model-fields-grid'
+        size='small'
+        rowKey={field => field.name}
+        dataSource={dataset.fields || []}
+        columns={fieldColumns}
+        pagination={false}
+        expandable={{
+          expandedRowRender: field => renderMetadata(field, field.name),
+          rowExpandable: hasMetadata
+        }}
+      />
+    </div>
+  )
+
+  return (
+    <>
+      <Spin spinning={store.activatedDetailsLoading}>
+        <Flex className='mb-2' gap='small' align='flex-start' ref={ref}>
+          <div className='size-8'>
+            <Icons.iconify icon='mdi:graph-outline' className='my-icon-large' 
/>
+          </div>
+          <div className='grow-1 relative bottom-1'>
+            <Title level={3} style={{ marginBottom: '0.125rem' }}>
+              <Space>
+                <span
+                  title={semanticModelName}
+                  className='min-w-10 truncate'
+                  style={{ maxWidth: `calc(${width}px - 90px)`, display: 
'inherit' }}
+                >
+                  {decodeURIComponent(semanticModelName || '')}
+                </span>
+                <Tooltip title='Edit'>
+                  <Button
+                    type='text'
+                    size='small'
+                    aria-label='Edit Semantic Model'
+                    icon={<Icons.Pencil className='size-4' />}
+                    disabled={store.activatedDetailsLoading || !definition}
+                    onClick={() => setOpenEdit(true)}
+                  />
+                </Tooltip>
+              </Space>
+            </Title>
+            <Paragraph
+              type='secondary'
+              className='truncate'
+              title={semanticModel?.comment}
+              style={{ marginBottom: 0, maxWidth: `calc(${width}px - 56px)` }}
+            >
+              {semanticModel?.comment}
+            </Paragraph>
+          </div>
+        </Flex>
+        <Space split={<Divider type='vertical' />} wrap={true} 
className='mb-2'>
+          {anthEnable && (
+            <Space size={4}>
+              <Tooltip title='Owned' placement='top'>
+                <Icons.User className='size-4' color='grey' />
+              </Tooltip>
+              <GetOwner
+                metalake={metalake}
+                metadataObjectType={'semantic_model'}
+                metadataObjectFullName={metadataObjectFullName}
+              />
+            </Space>
+          )}
+          {semanticModel?.audit?.creator && (
+            <Space size={4}>
+              <Tooltip title='Creator' placement='top'>
+                <Icons.UserPen className='size-4' color='grey' />
+              </Tooltip>
+              <span>{semanticModel.audit.creator}</span>
+            </Space>
+          )}
+          <Space size={4}>
+            <Tooltip title='Created' placement='top'>
+              <span className='inline-flex'>
+                <Icons.iconify icon='mdi:clock-outline' className='size-4' 
props={{ color: 'grey' }} />
+              </span>
+            </Tooltip>
+            <span>{createdAtText}</span>
+          </Space>
+          <Space size={4}>
+            <Tooltip title='Tags' placement='top'>
+              <Icons.Tags className='size-4' color='grey' />
+            </Tooltip>
+            {store.currentEntityTags && store.currentEntityTags?.length > 0 ? (
+              <Popover placement='bottom' title={<span>Tags</span>} 
content={tagContent}>
+                <a 
className='text-defaultPrimary'>{store.currentEntityTags?.length}</a>
+              </Popover>
+            ) : (
+              <a className='text-defaultPrimary'>0</a>
+            )}
+          </Space>
+          <Space size={4}>
+            <Tooltip title='Properties' placement='top'>
+              <Icons.TableProperties className='size-4' color='grey' />
+            </Tooltip>
+            {properties && Object.keys(properties).length > 0 ? (
+              <Popover placement='bottom' title={<span>Properties</span>} 
content={propertyContent}>
+                <a 
className='text-defaultPrimary'>{Object.keys(properties).length}</a>
+              </Popover>
+            ) : (
+              <a className='text-defaultPrimary'>0</a>
+            )}
+          </Space>
+          {semanticModel?.audit?.lastModifier && (
+            <Space size={4} data-refer='semantic-model-last-modifier'>
+              <Tooltip title='Last modified by'>
+                <Icons.UserPen className='size-4' color='grey' />
+              </Tooltip>
+              <span>{semanticModel.audit.lastModifier}</span>
+            </Space>
+          )}
+          {lastModifiedAt && (
+            <Space size={4} data-refer='semantic-model-last-modified-time'>
+              <Tooltip title='Last modified'>
+                <Icons.History className='size-4' color='grey' />
+              </Tooltip>
+              <span>{lastModifiedText}</span>
+            </Space>
+          )}
+        </Space>
+      </Spin>
+      <SemanticModelExport
+        key={metadataObjectFullName}
+        metalake={metalake}
+        catalog={catalog}
+        schema={schema}
+        semanticModel={semanticModelName}
+        disabled={store.activatedDetailsLoading || !definition}
+      />
+      {renderMetadata(definition, 'Model')}
+      <Tabs data-refer='details-tabs' activeKey={tabKey} onChange={setTabKey} 
items={tabOptions} />
+      <Spin spinning={store.activatedDetailsLoading}>
+        {tabKey === 'Datasets' && (
+          <Table
+            data-refer='semantic-model-datasets-grid'
+            size='small'
+            style={{ maxHeight: 'calc(100vh - 30rem)' }}
+            scroll={{ x: datasetTableWidth, y: 'calc(100vh - 37rem)' }}
+            dataSource={datasets}
+            columns={datasetResizableColumns}
+            components={datasetComponents}
+            expandable={{
+              expandedRowRender: expandedFieldsRow,
+              rowExpandable: dataset => (dataset.fields || []).length > 0 || 
hasMetadata(dataset)
+            }}
+            pagination={{ position: ['bottomCenter'], showSizeChanger: true }}
+          />
+        )}
+        {tabKey === 'Relationships' && (
+          <Table
+            data-refer='semantic-model-relationships-grid'
+            size='small'
+            style={{ maxHeight: 'calc(100vh - 30rem)' }}
+            scroll={{ x: relationshipTableWidth, y: 'calc(100vh - 37rem)' }}
+            dataSource={relationships}
+            columns={relationshipResizableColumns}
+            components={relationshipComponents}
+            expandable={{
+              expandedRowRender: relationship => renderMetadata(relationship, 
relationship.name),
+              rowExpandable: hasMetadata
+            }}
+            pagination={{ position: ['bottomCenter'], showSizeChanger: true }}
+          />
+        )}
+        {tabKey === 'Metrics' && (
+          <Table
+            data-refer='semantic-model-metrics-grid'
+            size='small'
+            style={{ maxHeight: 'calc(100vh - 30rem)' }}
+            scroll={{ x: metricTableWidth, y: 'calc(100vh - 37rem)' }}
+            dataSource={metrics}
+            columns={metricResizableColumns}
+            components={metricComponents}
+            expandable={{
+              expandedRowRender: metric => renderMetadata(metric, metric.name),
+              rowExpandable: hasMetadata
+            }}
+            pagination={{ position: ['bottomCenter'], showSizeChanger: true }}
+          />
+        )}
+        {tabKey === 'Definition' &&
+          (definitionText ? (
+            <div className='relative rounded border border-borderColor p-3'>
+              <Tooltip title='Copy definition' placement='top'>
+                <button
+                  type='button'
+                  className='absolute right-3 top-3 inline-flex cursor-pointer 
items-center rounded border border-borderColor bg-transparent p-1 
text-textSecondary transition-colors hover:text-defaultPrimary'
+                  onClick={onCopyDefinition}
+                >

Review Comment:
   This icon-only button has no accessible name; the tooltip text is not a 
reliable button label for assistive technology. Add an `aria-label` matching 
the action.



##########
web-v2/web/src/lib/utils/semanticModel.js:
##########
@@ -0,0 +1,283 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *  http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+import { isEqual, isPlainObject } from 'lodash-es'
+
+const SOURCE_NAMESPACE_LENGTH = 2
+const DEFINITION_INDENT = 2
+
+const isNonBlankString = value => typeof value === 'string' && value.trim() 
!== ''
+
+const duplicatesOf = names => {
+  const seen = new Set()
+  const duplicates = new Set()
+
+  names.forEach(name => {
+    if (seen.has(name)) {
+      duplicates.add(name)
+    }
+    seen.add(name)
+  })
+
+  return [...duplicates]
+}
+
+const validateSource = (dataset, errors) => {
+  const { name, source } = dataset
+
+  if (!isPlainObject(source)) {
+    errors.push(`Dataset "${name}" must have a source with a namespace and a 
name.`)
+
+    return
+  }
+
+  const { namespace } = source
+
+  if (!Array.isArray(namespace) || namespace.length !== 
SOURCE_NAMESPACE_LENGTH || !namespace.every(isNonBlankString)) {
+    errors.push(`Dataset "${name}" must have a source namespace of exactly 
[catalog, schema].`)
+  }
+
+  if (!isNonBlankString(source.name)) {
+    errors.push(`Dataset "${name}" must have a source with a non-empty name.`)
+  }
+}
+
+const validateDatasets = (datasets, errors) => {
+  datasets.forEach((dataset, index) => {
+    if (!isPlainObject(dataset) || !isNonBlankString(dataset.name)) {
+      errors.push(`datasets[${index}] must have a non-empty name.`)
+
+      return
+    }
+
+    validateSource(dataset, errors)
+
+    const fields = dataset.fields
+    if (fields !== undefined && !Array.isArray(fields)) {
+      errors.push(`Dataset "${dataset.name}" must declare fields as an array.`)
+
+      return
+    }
+
+    ;(fields || []).forEach((field, fieldIndex) => {
+      if (!isPlainObject(field) || !isNonBlankString(field.name)) {
+        errors.push(`datasets[${index}].fields[${fieldIndex}] must have a 
non-empty name.`)
+      }
+    })
+
+    const duplicateFields = duplicatesOf((fields || []).map(field => 
field?.name).filter(isNonBlankString))
+    if (duplicateFields.length) {
+      errors.push(`Field names must be unique within dataset 
"${dataset.name}": ${duplicateFields.join(', ')}.`)
+    }
+  })
+
+  const duplicateDatasets = duplicatesOf(datasets.map(dataset => 
dataset?.name).filter(isNonBlankString))
+  if (duplicateDatasets.length) {
+    errors.push(`Dataset names must be unique within the semantic model: 
${duplicateDatasets.join(', ')}.`)
+  }
+}
+
+const validateRelationships = (relationships, datasetNames, errors) => {
+  relationships.forEach((relationship, index) => {
+    if (!isPlainObject(relationship) || !isNonBlankString(relationship.name)) {
+      errors.push(`relationships[${index}] must have a non-empty name.`)
+
+      return
+    }
+
+    const { name, from, to, fromColumns, toColumns } = relationship
+
+    ;[from, to].forEach(endpoint => {
+      if (!datasetNames.has(endpoint)) {
+        errors.push(`Relationship "${name}" references an unknown dataset 
"${endpoint}".`)
+      }
+    })
+
+    if (!Array.isArray(fromColumns) || !Array.isArray(toColumns) || 
!fromColumns.length || !toColumns.length) {
+      errors.push(`Relationship "${name}" must have non-empty fromColumns and 
toColumns.`)
+
+      return
+    }
+
+    if (fromColumns.length !== toColumns.length) {
+      errors.push(`Relationship "${name}" must have the same number of 
fromColumns and toColumns.`)
+    }
+  })
+
+  const duplicates = duplicatesOf(relationships.map(relationship => 
relationship?.name).filter(isNonBlankString))
+  if (duplicates.length) {
+    errors.push(`Relationship names must be unique within the semantic model: 
${duplicates.join(', ')}.`)
+  }
+}
+
+const validateMetrics = (metrics, errors) => {
+  metrics.forEach((metric, index) => {
+    if (!isPlainObject(metric) || !isNonBlankString(metric.name)) {
+      errors.push(`metrics[${index}] must have a non-empty name.`)
+    }
+  })
+
+  const duplicates = duplicatesOf(metrics.map(metric => 
metric?.name).filter(isNonBlankString))
+  if (duplicates.length) {
+    errors.push(`Metric names must be unique within the semantic model: 
${duplicates.join(', ')}.`)
+  }
+}
+
+/**
+ * Checks the structural rules the server also enforces, so obvious mistakes 
are reported before the
+ * request is sent. The server stays the authority: it additionally resolves 
every dataset source
+ * and its columns against the catalog, which the browser cannot do.
+ *
+ * @param {unknown} definition The parsed semantic model definition.
+ * @returns {string[]} The problems found, empty when the definition looks 
well formed.
+ */
+export const validateSemanticModelDefinition = definition => {

Review Comment:
   This validator still accepts nested definitions the native API is guaranteed 
to reject—for example, fields or metrics without the required non-empty 
`expression.dialects`, blank relationship-column entries, and duplicate dialect 
names. Since the editor gates submission on this function and source resolution 
is documented as the server-only extra check, mirror the nested invariants from 
`SemanticModelDefinitionValidator` so these structural errors are reported 
before sending.



##########
web-v2/web/src/app/catalogs/rightContent/entitiesContent/SemanticModelDetailsPage.js:
##########
@@ -0,0 +1,575 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *  http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+'use client'
+
+import { useMemo, useState } from 'react'
+import { Button, Divider, Flex, Popover, Space, Spin, Table, Tabs, Tag, 
Tooltip, Typography, message } from 'antd'
+import { useAntdColumnResize } from 'react-antd-column-resize'
+import useResizeObserver from 'use-resize-observer'
+import { useRouter, useSearchParams } from 'next/navigation'
+import Tags from '@/components/CustomTags'
+import GetOwner from '@/components/GetOwner'
+import Icons from '@/components/Icons'
+import PropertiesContent from '@/components/PropertiesContent'
+import { useAppDispatch, useAppSelector } from '@/lib/hooks/useStore'
+import { getSemanticModelDetails } from '@/lib/store/metalakes'
+import { copyToClipboard } from '@/lib/utils'
+import { formatToDateTime, isValidDate } from '@/lib/utils/date'
+import { formatSemanticModelDefinition } from '@/lib/utils/semanticModel'
+import SemanticModelAIContext from './SemanticModelAIContext'
+import SemanticModelExport from './SemanticModelExport'
+import SemanticModelExtensions from './SemanticModelExtensions'
+import CreateSemanticModelDialog from '../CreateSemanticModelDialog'
+
+const { Title, Paragraph } = Typography
+
+const sourceFullName = source => {
+  if (!source) {
+    return '-'
+  }
+
+  return [...(source.namespace || []), source.name].filter(Boolean).join('.')
+}
+
+const renderExpression = expression => {
+  const dialects = expression?.dialects || []
+
+  if (!dialects.length) {
+    return <span>-</span>
+  }
+
+  return (
+    <Space direction='vertical' size={2}>
+      {dialects.map((dialect, index) => (
+        <span key={`${dialect?.dialect}-${index}`}>
+          <Tag>{dialect?.dialect}</Tag>
+          <span className='font-mono text-xs'>{dialect?.expression}</span>
+        </span>
+      ))}
+    </Space>
+  )
+}
+
+const renderColumns = columns => <span className='font-mono text-xs'>{(columns 
|| []).join(', ') || '-'}</span>
+
+const hasMetadata = entity => !!entity.aiContext || 
entity.customExtensions?.length > 0
+
+const renderMetadata = (entity, label) => (
+  <>
+    <SemanticModelAIContext context={entity?.aiContext} label={`${label} AI 
Context`} />
+    <SemanticModelExtensions extensions={entity?.customExtensions} 
label={`${label} Vendor Extensions`} />
+  </>
+)
+
+export default function SemanticModelDetailsPage() {
+  const searchParams = useSearchParams()
+  const router = useRouter()
+  const dispatch = useAppDispatch()
+  const metalake = searchParams.get('metalake')
+  const catalog = searchParams.get('catalog')
+  const schema = searchParams.get('schema')
+  const semanticModelName = searchParams.get('semanticModel')
+  const auth = useAppSelector(state => state.auth)
+  const { anthEnable } = auth
+  const store = useAppSelector(state => state.metalakes)
+  const semanticModel = store.activatedDetails
+  const [tabKey, setTabKey] = useState('Datasets')
+  const [openEdit, setOpenEdit] = useState(false)
+  const { ref, width } = useResizeObserver()
+
+  const definition = semanticModel?.definition
+  const properties = semanticModel?.properties
+  const createdAt = semanticModel?.audit?.createTime
+  const createdAtText = !createdAt || !isValidDate(createdAt) ? '-' : 
formatToDateTime(createdAt)
+  const lastModifiedAt = semanticModel?.audit?.lastModifiedTime
+  const lastModifiedText = !lastModifiedAt || !isValidDate(lastModifiedAt) ? 
'-' : formatToDateTime(lastModifiedAt)
+  const metadataObjectFullName = `${catalog}.${schema}.${semanticModelName}`
+
+  const datasets = useMemo(
+    () => (definition?.datasets || []).map(dataset => ({ ...dataset, key: 
dataset.name })),
+    [definition]
+  )
+
+  const relationships = useMemo(
+    () => (definition?.relationships || []).map(relationship => ({ 
...relationship, key: relationship.name })),
+    [definition]
+  )
+
+  const metrics = useMemo(
+    () => (definition?.metrics || []).map(metric => ({ ...metric, key: 
metric.name })),
+    [definition]
+  )
+
+  const definitionText = useMemo(() => 
formatSemanticModelDefinition(definition), [definition])
+
+  const tagContent = (
+    <div>
+      <Tags readOnly={true} metadataObjectType={'semantic_model'} 
metadataObjectFullName={metadataObjectFullName} />
+    </div>
+  )
+
+  const propertyContent = <PropertiesContent properties={properties} />
+
+  const onSaved = async updated => {
+    if (updated.name !== semanticModelName) {
+      const params = new URLSearchParams(searchParams.toString())
+      params.set('semanticModel', updated.name)
+      router.replace(`/catalogs?${params.toString()}`)
+    } else {
+      await dispatch(getSemanticModelDetails({ metalake, catalog, schema, 
semanticModel: updated.name, init: true }))
+    }
+  }
+
+  const onCopyDefinition = async () => {
+    try {
+      await copyToClipboard(definitionText)
+      message.success('Definition copied!')
+    } catch (err) {
+      console.error('Failed to copy definition: ', err)
+      message.error('Failed to copy definition')
+    }
+  }
+
+  const datasetColumns = useMemo(
+    () => [
+      {
+        title: 'Dataset Name',
+        dataIndex: 'name',
+        key: 'name',
+        width: 200,
+        ellipsis: true,
+        sorter: (a, b) => 
a.name.toLowerCase().localeCompare(b.name.toLowerCase())
+      },
+      {
+        title: 'Source',
+        dataIndex: 'source',
+        key: 'source',
+        width: 260,
+        ellipsis: true,
+        render: source => <span className='font-mono 
text-xs'>{sourceFullName(source)}</span>
+      },
+      {
+        title: 'Primary Key',
+        dataIndex: 'primaryKey',
+        key: 'primaryKey',
+        width: 180,
+        ellipsis: true,
+        render: renderColumns
+      },
+      {
+        title: 'Unique Keys',
+        dataIndex: 'uniqueKeys',
+        key: 'uniqueKeys',
+        width: 220,
+        render: keys =>
+          keys?.length ? (
+            <Space direction='vertical' size={4}>
+              {keys.map((columns, index) => (
+                <Tag key={index}>{renderColumns(columns)}</Tag>
+              ))}
+            </Space>
+          ) : (
+            <span>-</span>
+          )
+      },
+      {
+        title: 'Fields',
+        dataIndex: 'fields',
+        key: 'fields',
+        width: 80,
+        render: fields => <span>{(fields || []).length}</span>
+      },
+      {
+        title: 'Description',
+        dataIndex: 'description',
+        key: 'description',
+        ellipsis: true,
+        render: description => <span>{description || '-'}</span>
+      }
+    ],
+    []
+  )
+
+  const fieldColumns = useMemo(
+    () => [
+      {
+        title: 'Field Name',
+        dataIndex: 'name',
+        key: 'name',
+        width: 220,
+        render: (name, field) => (
+          <div className='break-words'>
+            <div>{name}</div>
+            {field.label && <Typography.Text 
type='secondary'>{field.label}</Typography.Text>}
+          </div>
+        )
+      },
+      {
+        title: 'Data Type',
+        dataIndex: 'datatype',
+        key: 'datatype',
+        width: 140,
+        render: datatype => (datatype ? <Tag>{datatype}</Tag> : <span>-</span>)
+      },
+      {
+        title: 'Time Dimension',
+        dataIndex: 'dimension',
+        key: 'dimension',
+        width: 140,
+        render: dimension => <span>{dimension?.isTime ? 'Yes' : 'No'}</span>
+      },
+      {
+        title: 'Expression',
+        dataIndex: 'expression',
+        key: 'expression',
+        render: renderExpression
+      },
+      {
+        title: 'Description',
+        dataIndex: 'description',
+        key: 'description',
+        ellipsis: true,
+        render: description => <span>{description || '-'}</span>
+      }
+    ],
+    []
+  )
+
+  const relationshipColumns = useMemo(
+    () => [
+      {
+        title: 'Relationship Name',
+        dataIndex: 'name',
+        key: 'name',
+        width: 220,
+        ellipsis: true,
+        sorter: (a, b) => 
a.name.toLowerCase().localeCompare(b.name.toLowerCase())
+      },
+      { title: 'From', dataIndex: 'from', key: 'from', width: 160, ellipsis: 
true },
+      {
+        title: 'From Columns',
+        dataIndex: 'fromColumns',
+        key: 'fromColumns',
+        width: 200,
+        ellipsis: true,
+        render: renderColumns
+      },
+      { title: 'To', dataIndex: 'to', key: 'to', width: 160, ellipsis: true },
+      {
+        title: 'To Columns',
+        dataIndex: 'toColumns',
+        key: 'toColumns',
+        ellipsis: true,
+        render: renderColumns
+      }
+    ],
+    []
+  )
+
+  const metricColumns = useMemo(
+    () => [
+      {
+        title: 'Metric Name',
+        dataIndex: 'name',
+        key: 'name',
+        width: 200,
+        ellipsis: true,
+        sorter: (a, b) => 
a.name.toLowerCase().localeCompare(b.name.toLowerCase())
+      },
+      {
+        title: 'Data Type',
+        dataIndex: 'datatype',
+        key: 'datatype',
+        width: 140,
+        render: datatype => (datatype ? <Tag>{datatype}</Tag> : <span>-</span>)
+      },
+      {
+        title: 'Expression',
+        dataIndex: 'expression',
+        key: 'expression',
+        render: renderExpression
+      },
+      {
+        title: 'Description',
+        dataIndex: 'description',
+        key: 'description',
+        ellipsis: true,
+        render: description => <span>{description || '-'}</span>
+      }
+    ],
+    []
+  )
+
+  const tabOptions = [
+    { label: 'Datasets', key: 'Datasets' },
+    { label: 'Relationships', key: 'Relationships' },
+    { label: 'Metrics', key: 'Metrics' },
+    { label: 'Definition', key: 'Definition' }
+  ]

Review Comment:
   The PR description promises separate detail tabs for datasets, fields, 
relationships, metrics, and the JSON definition, but this tab list omits 
Fields; fields are only available by expanding individual dataset rows. Add the 
advertised Fields tab, or update the PR description if the nested-only 
presentation is intentional.



##########
web-v2/web/src/app/catalogs/rightContent/entitiesContent/SchemaDetailsPage.js:
##########
@@ -631,6 +657,77 @@ export default function SchemaDetailsPage() {
     [currentMetalake, catalogType, catalog, schema, catalogData?.provider]
   )
 
+  const semanticModelColumns = useMemo(
+    () => [
+      {
+        title: 'Semantic Model Name',
+        dataIndex: 'name',
+        key: 'name',
+        width: 300,
+        ellipsis: true,
+        sorter: (a, b) => 
a?.name.toLowerCase().localeCompare(b?.name.toLowerCase()),
+        render: name => (
+          <Link
+            data-refer={`semantic-model-link-${name}`}
+            
href={`/catalogs?metalake=${encodeURIComponent(currentMetalake)}&catalogType=${catalogType}&catalog=${encodeURIComponent(catalog)}&schema=${encodeURIComponent(schema)}&semanticModel=${encodeURIComponent(name)}`}
+          >
+            {name}
+          </Link>
+        )
+      },
+      {
+        title: 'Tags',
+        dataIndex: 'tags',
+        key: 'tags',
+        render: (_, record) => (
+          <Tags metadataObjectType={'semantic_model'} 
metadataObjectFullName={`${catalog}.${schema}.${record.name}`} />
+        )
+      },
+      {
+        title: 'Actions',
+        dataIndex: 'action',
+        key: 'action',
+        width: 100,
+        render: (_, record) => (
+          <Space size={4}>
+            <a data-refer={`edit-semantic-model-${record.name}`}>
+              <Tooltip title='Edit'>
+                <Icons.Pencil
+                  className='size-4 hover:cursor-pointer 
hover:text-defaultPrimary'
+                  onClick={() => {
+                    setEditSemanticModel(record.name)
+                    setOpenSemanticModel(true)
+                  }}
+                />
+              </Tooltip>
+            </a>
+            <a data-refer={`delete-semantic-model-${record.name}`}>
+              <Tooltip title='Delete'>
+                <Icons.Trash2Icon
+                  className='size-4 hover:cursor-pointer 
hover:text-defaultPrimary'
+                  onClick={() => showDeleteConfirm(record, 'semanticModel')}
+                />
+              </Tooltip>
+            </a>
+            {anthEnable && (

Review Comment:
   The Edit and Delete controls are click handlers on unfocusable SVGs inside 
anchors without `href`, so keyboard and screen-reader users cannot operate or 
identify them. Use icon `Button`s with `aria-label`s and put each `onClick` on 
the button, as the adjacent Set Owner action does.



##########
web-v2/web/src/lib/store/metalakes/index.js:
##########
@@ -2333,6 +2376,142 @@ export const deleteView = createAsyncThunk(
   }
 )
 
+export const fetchSemanticModels = createAsyncThunk(
+  'appMetalakes/fetchSemanticModels',
+  async ({ init, metalake, catalog, schema }, { getState, dispatch }) => {
+    const [err, res] = await to(getSemanticModelsApi({ metalake, catalog, 
schema }, { errorMessageMode: 'none' }))
+
+    if (err) {
+      // The catalog doesn't support semantic models (405), or the server 
predates the endpoint and
+      // has no route for it (404). Both mean "this schema has none" - return 
empty silently rather
+      // than failing every schema page against an older server.
+      if ([404, 405].includes(err?.response?.status)) {
+        return { semanticModels: [], init }
+      }
+      throw err instanceof Error ? err : new Error(err?.message ?? String(err))
+    }
+
+    if (!res) {
+      throw new Error('Semantic Model list returned an empty response')
+    }
+
+    const { identifiers = [] } = res || {}
+
+    const semanticModels = identifiers.map(semanticModelItem => {
+      return {
+        ...semanticModelItem,
+        node: 'semanticModel',
+        id: semanticModelNodeKey({ metalake, catalog, schema, semanticModel: 
semanticModelItem.name }),
+        key: semanticModelNodeKey({ metalake, catalog, schema, semanticModel: 
semanticModelItem.name }),
+        path: `?${new URLSearchParams({
+          metalake,
+          catalog,
+          catalogType: 'relational',
+          schema,
+          semanticModel: semanticModelItem.name
+        }).toString()}`,
+        name: semanticModelItem.name,
+        title: semanticModelItem.name,
+        isLeaf: true,
+        children: []
+      }
+    })
+
+    if (
+      init &&
+      
getState().metalakes.loadedNodes.includes(`{{${metalake}}}{{${catalog}}}{{${'relational'}}}{{${schema}}}`)
+    ) {
+      const schemaKey = 
`{{${metalake}}}{{${catalog}}}{{${'relational'}}}{{${schema}}}`
+      dispatch(
+        setIntoTreeNodes({
+          key: schemaKey,
+          data: mergeWithSemanticModelNodes({
+            tree: getState().metalakes.metalakeTree,
+            key: schemaKey,
+            entities: semanticModels
+          })
+        })
+      )
+    }
+
+    return { semanticModels, init }
+  }
+)
+
+export const getSemanticModelDetails = createAsyncThunk(
+  'appMetalakes/getSemanticModelDetails',
+  async ({ init, metalake, catalog, schema, semanticModel }) => {
+    const [err, res] = await to(
+      getSemanticModelDetailsApi({ metalake, catalog, schema, semanticModel }, 
{ errorMessageMode: 'none' })
+    )
+
+    if (err) {
+      // Catalog doesn't support semantic models (HTTP 405) - return empty 
result silently
+      if (err?.response?.status === 405) {
+        return { semanticModel: null, init }
+      }
+      throw err instanceof Error ? err : new Error(err?.message ?? String(err))
+    }
+
+    if (!res) {
+      throw new Error('Semantic Model details returned an empty response')
+    }
+
+    return { semanticModel: res.semanticModel || res, init }
+  }
+)
+
+export const createSemanticModel = createAsyncThunk(
+  'appMetalakes/createSemanticModel',
+  async ({ data, metalake, catalog, schema }, { dispatch }) => {
+    await dispatch(setTableLoading(true))
+    const [err, res] = await to(createSemanticModelApi({ data, metalake, 
catalog, schema }))
+    await dispatch(setTableLoading(false))
+
+    if (err || !res) {
+      return { err: true }
+    }
+
+    await dispatch(fetchSemanticModels({ metalake, catalog, schema, init: true 
}))
+
+    return res.semanticModel
+  }
+)
+
+export const updateSemanticModel = createAsyncThunk(
+  'appMetalakes/updateSemanticModel',
+  async ({ metalake, catalog, schema, semanticModel, data }, { dispatch }) => {
+    await dispatch(setTableLoading(true))
+    const [err, res] = await to(updateSemanticModelApi({ metalake, catalog, 
schema, semanticModel, data }))
+    await dispatch(setTableLoading(false))
+
+    if (err || !res) {
+      return { err: true }
+    }
+
+    await dispatch(fetchSemanticModels({ metalake, catalog, schema, init: true 
}))
+
+    return res.semanticModel
+  }
+)
+
+export const deleteSemanticModel = createAsyncThunk(
+  'appMetalakes/deleteSemanticModel',
+  async ({ metalake, catalog, schema, semanticModel }, { dispatch }) => {
+    await dispatch(setTableLoading(true))
+    const [err, res] = await to(deleteSemanticModelApi({ metalake, catalog, 
schema, semanticModel }))
+    await dispatch(setTableLoading(false))
+
+    if (err || !res) {
+      throw new Error(err)
+    }

Review Comment:
   When Axios rejects with its normal response object, `new Error(err)` turns 
the useful server message into `[object Object]`. This makes failed Semantic 
Model deletions produce a non-actionable toast; preserve an existing `Error` or 
construct one from `err.message`, as the new list/detail thunks already do.



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