imback82 commented on a change in pull request #25247: [SPARK-28319][SQL]
Implement SHOW TABLES for Data Source V2 Tables
URL: https://github.com/apache/spark/pull/25247#discussion_r310434883
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File path:
sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/DataSourceResolution.scala
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@@ -163,6 +163,24 @@ case class DataSourceResolution(
case DataSourceV2Relation(CatalogTableAsV2(catalogTable), _, _) =>
UnresolvedCatalogRelation(catalogTable)
+ case ShowTablesStatement(None, pattern) =>
+ defaultCatalog match {
+ case Some(_) =>
+ throw new AnalysisException(
+ "v2 catalog doesn't support getCurrentDatabase yet, " +
+ "so the default database name cannot be deduced.")
+ case None =>
+ ShowTablesCommand(None, pattern)
+ }
+
+ case plan @ ShowTablesStatement(Some(namespace), pattern) =>
+ val CatalogObjectIdentifier(maybeCatalog, identifier) = namespace
Review comment:
Assuming there exists a CatalogPlug with a name `catalog`, what should `SHOW
TABLES FROM catalog` resolve to?
1) CatalogNamespace(None, Seq("catalog")) or
2) CatalogNamespace(Some[CatalogPlugin], Seq())
If we go with 2), what will be the default behavior if the user was
specifying `catalog` as a database name?
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