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https://issues.apache.org/jira/browse/FLINK-8240?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16334937#comment-16334937
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ASF GitHub Bot commented on FLINK-8240:
---------------------------------------
Github user fhueske commented on a diff in the pull request:
https://github.com/apache/flink/pull/5240#discussion_r162999931
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/descriptors/TableSourceDescriptor.scala
---
@@ -0,0 +1,66 @@
+/*
+ * 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.
+ */
+
+package org.apache.flink.table.descriptors
+
+import org.apache.flink.table.descriptors.DescriptorUtils.statistics
+import org.apache.flink.table.plan.stats.TableStats
+
+import scala.collection.JavaConverters._
+
+/**
+ * Common class for all descriptors describing a table source.
+ */
+abstract class TableSourceDescriptor extends Descriptor {
+
+ protected var schemaDescriptor: Option[Schema] = None
+ protected var connectorDescriptor: Option[ConnectorDescriptor] = None
+ protected var encodingDescriptor: Option[EncodingDescriptor] = None
+ protected var proctimeDescriptor: Option[Proctime] = None
+ protected var rowtimeDescriptor: Option[Rowtime] = None
+ protected var statisticsDescriptor: Option[Statistics] = None
+ protected var metaDescriptor: Option[Metadata] = None
+
--- End diff --
We might need another descriptor for mapping fields of the encoding (or
connector) to fields in the table schema. This can be used to rename or select
fields from the encoding to the table schema. This would be the configuration
for the `DefinedFieldMapping` interface.
> Create unified interfaces to configure and instatiate TableSources
> ------------------------------------------------------------------
>
> Key: FLINK-8240
> URL: https://issues.apache.org/jira/browse/FLINK-8240
> Project: Flink
> Issue Type: New Feature
> Components: Table API & SQL
> Reporter: Timo Walther
> Assignee: Timo Walther
> Priority: Major
>
> At the moment every table source has different ways for configuration and
> instantiation. Some table source are tailored to a specific encoding (e.g.,
> {{KafkaAvroTableSource}}, {{KafkaJsonTableSource}}) or only support one
> encoding for reading (e.g., {{CsvTableSource}}). Each of them might implement
> a builder or support table source converters for external catalogs.
> The table sources should have a unified interface for discovery, defining
> common properties, and instantiation. The {{TableSourceConverters}} provide a
> similar functionality but use an external catalog. We might generialize this
> interface.
> In general a table source declaration depends on the following parts:
> {code}
> - Source
> - Type (e.g. Kafka, Custom)
> - Properties (e.g. topic, connection info)
> - Encoding
> - Type (e.g. Avro, JSON, CSV)
> - Schema (e.g. Avro class, JSON field names/types)
> - Rowtime descriptor/Proctime
> - Watermark strategy and Watermark properties
> - Time attribute info
> - Bucketization
> {code}
> This issue needs a design document before implementation. Any discussion is
> very welcome.
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