dtenedor commented on code in PR #42810:
URL: https://github.com/apache/spark/pull/42810#discussion_r1316435058
##########
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/v2AlterTableCommands.scala:
##########
@@ -228,6 +228,15 @@ case class AlterColumn(
TableChange.updateColumnPosition(colName, newPosition.position)
}
val defaultValueChange = setDefaultExpression.map { newDefaultExpression =>
+ if (newDefaultExpression.nonEmpty) {
+ val newDataType = if (dataType.isDefined) {
Review Comment:
you can use `dataType.getOrElse` to simplify here
##########
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/v2AlterTableCommands.scala:
##########
@@ -228,6 +228,15 @@ case class AlterColumn(
TableChange.updateColumnPosition(colName, newPosition.position)
}
val defaultValueChange = setDefaultExpression.map { newDefaultExpression =>
+ if (newDefaultExpression.nonEmpty) {
Review Comment:
Maybe just put a comment here saying "We call
'ResolveDefaultColumns.analyze' here to make sure that the default value parses
successfully, and return an error otherwise"?
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