rusackas commented on a change in pull request #12008:
URL: 
https://github.com/apache/incubator-superset/pull/12008#discussion_r545417239



##########
File path: superset-frontend/src/explore/components/DatasourcePanel.tsx
##########
@@ -0,0 +1,197 @@
+/**
+ * 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 React, { useEffect, useState } from 'react';
+import { styled, t, QueryFormData } from '@superset-ui/core';
+import { Collapse } from 'src/common/components';
+import {
+  ColumnOption,
+  MetricOption,
+  ControlType,
+} from '@superset-ui/chart-controls';
+import { ExploreActions } from '../actions/exploreActions';
+import Control from './Control';
+
+interface DatasourceControl {
+  validationErrors: any;
+  mapStateToProps: QueryFormData;
+  type: ControlType;
+  label: string;
+  datasource?: DatasourceControl;
+}
+
+interface Props {
+  datasource: {
+    columns: Array<any>;
+    metrics: Array<any>;
+  };
+  controls: {
+    datasource: DatasourceControl;
+  };
+  actions: Partial<ExploreActions> & Pick<ExploreActions, 'setControlValue'>;
+}
+
+const DatasourceContainer = styled.div`
+  background-color: ${({ theme }) => theme.colors.grayscale.light4};
+  position: relative;
+  height: 100%;
+  .field-selections {
+    padding: 0 ${({ theme }) => 2 * theme.gridUnit}px;
+  }
+  .ant-collapse
+    > .ant-collapse-item
+    > .ant-collapse-header
+    .ant-collapse-arrow {
+    right: ${({ theme }) => theme.gridUnit * -50}px;
+  }
+  .ant-collapse > .ant-collapse-item > .ant-collapse-header {
+    padding-left: 10px;
+    padding-bottom: 0px;
+  }
+  .form-control.input-sm {
+    margin-bottom: ${({ theme }) => theme.gridUnit * 3}px;
+  }
+  .ant-collapse-item {
+    background-color: ${({ theme }) => theme.colors.grayscale.light4};
+    .anticon.anticon-right.ant-collapse-arrow > svg {
+      transform: rotate(90deg) !important;
+    }
+  }
+  .ant-collapse-item.ant-collapse-item-active {
+    .anticon.anticon-right.ant-collapse-arrow > svg {
+      transform: rotate(-90deg) !important;
+    }
+  }
+  .header {
+    font-size: ${({ theme }) => theme.typography.sizes.l}px;
+    margin-left: ${({ theme }) => theme.gridUnit * -2}px;
+  }
+  .ant-collapse-content-box > div {
+    margin-left: -14px;
+  }
+  .type-label {
+    text-align: left;
+  }
+  .metric-option .option-label {
+    margin-left: ${({ theme }) => theme.gridUnit * -5}px;
+  }
+  .field-selections {
+    position: absolute;
+    top: ${({ theme }) => theme.gridUnit * 15}px;
+    bottom: 0;
+    left: 0;
+    right: 0;
+    overflow: auto;
+  }
+  .field-length {
+    margin-top: -3px;
+    margin-bottom: ${({ theme }) => theme.gridUnit * 2}px;
+    font-size: ${({ theme }) => theme.typography.sizes.s}px;
+    color: ${({ theme }) => theme.colors.grayscale.light1};
+  }
+`;
+
+const DataSourcePanel = ({
+  datasource,
+  controls: { datasource: datasourceControl },
+  actions,
+}: Props) => {
+  const { columns, metrics } = datasource;
+  const [lists, setList] = useState({
+    columns,
+    metrics,
+  });
+  const search = ({ target: { value } }: { target: { value: string } }) => {
+    if (value === '') {
+      setList({ columns, metrics });
+      return;
+    }
+    const filteredColumns = lists.columns.filter(
+      column => column.column_name.indexOf(value) !== -1,
+    );
+    const filteredMetrics = lists.metrics.filter(
+      metric => metric.metric_name.indexOf(value) !== -1,
+    );
+    setList({ columns: filteredColumns, metrics: filteredMetrics });
+  };
+  useEffect(() => {
+    setList({
+      columns,
+      metrics,
+    });
+  }, [datasource]);
+
+  const metricSlice = lists.metrics.slice(0, 50);
+  const columnSlice = lists.columns.slice(0, 50);

Review comment:
       I spent some time trying to get the virtual list working, but it 
requires a prop with the `height` value. Since this is all CSS-based layout 
(hooray!) this got difficult quickly, using refs and more lifecycle hooks than 
I'd care to fiddle with in this PR. 
   
   I think I see a path forward with `ParentSize` from `@vx/responsive` but 
that might wing up being a fast-follow PR.




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