Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/16313#discussion_r92941135
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/command/createDataSourceTables.scala
---
@@ -157,39 +156,74 @@ case class CreateDataSourceTableAsSelectCommand(
// Since the table already exists and the save mode is Ignore,
we will just return.
return Seq.empty[Row]
case SaveMode.Append =>
+ val existingTable =
sessionState.catalog.getTableMetadata(tableIdentWithDB)
--- End diff --
they are different. The input table just contains some user-specified
information and the schema is always empty.
https://github.com/cloud-fan/spark/blob/b1dbd0a19a174eaae1aaf114e04f6d3683ea65c4/sql/core/src/main/scala/org/apache/spark/sql/execution/command/createDataSourceTables.scala#L135
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