Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/15266#discussion_r83788778
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/rules.scala
---
@@ -252,6 +251,8 @@ case class PreprocessTableInsertion(conf: SQLConf)
extends Rule[LogicalPlan] {
if (expected.dataType.sameType(actual.dataType) && expected.name
== actual.name) {
actual
} else {
+ // Renaming is needed for handling the INSERT statement like
+ // INSERT INTO TABLE tab1 SELECT 1, 2
Alias(Cast(actual, expected.dataType), expected.name)()
--- End diff --
What if we copy the metadata during alias? Does it work too?
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