cloud-fan commented on code in PR #44302:
URL: https://github.com/apache/spark/pull/44302#discussion_r1423174851
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sql/core/src/main/scala/org/apache/spark/sql/execution/command/ddl.scala:
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@@ -374,6 +374,7 @@ case class AlterTableChangeColumnCommand(
// TODO: support change column name/dataType/metadata/position.
override def run(sparkSession: SparkSession): Seq[Row] = {
val catalog = sparkSession.sessionState.catalog
+ catalog.refreshTable(tableName)
Review Comment:
let's add some code comments to explain the reason: this command may change
column default values and we need to refresh the table relation cache so that
DML commands can resolve default values correctly.
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