Github user rdblue commented on a diff in the pull request:
https://github.com/apache/spark/pull/21306#discussion_r211057651
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/catalog/v2/V1MetadataTable.scala
---
@@ -0,0 +1,118 @@
+/*
+ * 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.spark.sql.catalog.v2
+
+import java.util
+
+import scala.collection.JavaConverters._
+
+import org.apache.spark.sql.SaveMode
+import org.apache.spark.sql.catalog.v2.PartitionTransforms.{bucket,
identity}
+import org.apache.spark.sql.catalyst.catalog.CatalogTable
+import org.apache.spark.sql.sources.v2.{DataSourceOptions, DataSourceV2,
ReadSupport, WriteSupport}
+import org.apache.spark.sql.sources.v2.reader.DataSourceReader
+import org.apache.spark.sql.sources.v2.writer.DataSourceWriter
+import org.apache.spark.sql.types.StructType
+
+/**
+ * An implementation of catalog v2 [[Table]] to expose v1 table metadata.
+ */
+private[sql] class V1MetadataTable(
--- End diff --
@cloud-fan, I updated this PR that adds the `TableCatalog` API to include
an implementation that uses the existing `SessionCatalog`. This `Table` class
demonstrates how `Table` would implement `ReadSupport` and `WriteSupport`.
The catalog returns these tables, which have `ReadSupport` and
`WriteSupport` mixed in depending on whether the underlying `DataSourceV2` also
supports them. In your updated API, it would use the `ReadSupportProvider`
instead of the `DataSourceV2` directly, but the difference isn't very large.
The follow-up PR for CTAS and RTAS, #21877, demonstrates how this would be
used in the new logical plans.
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