gengliangwang commented on code in PR #36122:
URL: https://github.com/apache/spark/pull/36122#discussion_r859976501
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sql/core/src/main/scala/org/apache/spark/sql/execution/command/ddl.scala:
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@@ -353,7 +353,18 @@ case class AlterTableChangeColumnCommand(
val newDataSchema = table.dataSchema.fields.map { field =>
if (field.name == originColumn.name) {
// Create a new column from the origin column with the new comment.
- addComment(field, newColumn.getComment)
+ val withNewComment: StructField =
+ addComment(field, newColumn.getComment)
+ // Create a new column from the origin column with the new current
default value.
+ if (newColumn.getCurrentDefaultValue().isDefined) {
+ if (newColumn.getCurrentDefaultValue().get.nonEmpty) {
+ addCurrentDefaultValue(withNewComment,
newColumn.getCurrentDefaultValue())
+ } else {
+ withNewComment.clearCurrentDefaultValue()
Review Comment:
What if the column is string type and the default value is set as `""`?
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