Github user yhuai commented on a diff in the pull request:
https://github.com/apache/spark/pull/13013#discussion_r62742240
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/command/createDataSourceTables.scala
---
@@ -192,6 +192,11 @@ case class CreateDataSourceTableAsSelectCommand(
EliminateSubqueryAliases(
sessionState.catalog.lookupRelation(tableIdent)) match {
case l @ LogicalRelation(_: InsertableRelation | _:
HadoopFsRelation, _, _) =>
+ if (query.schema.size != l.schema.size) {
+ throw new AnalysisException(
+ s"The column number of the existing schema[${l.schema}]
" +
+ s"doesn't match the data schema[${query.schema}]'s")
+ }
--- End diff --
ah seems we will have an exception. Where do we throw the exception?
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