Github user maropu commented on a diff in the pull request:
https://github.com/apache/spark/pull/19773#discussion_r215279507
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/command/ddl.scala ---
@@ -318,18 +318,34 @@ case class AlterTableChangeColumnCommand(
// Find the origin column from dataSchema by column name.
val originColumn = findColumnByName(table.dataSchema, columnName,
resolver)
- // Throw an AnalysisException if the column name/dataType is changed.
+ // Throw an AnalysisException if the column name is changed.
if (!columnEqual(originColumn, newColumn, resolver)) {
throw new AnalysisException(
"ALTER TABLE CHANGE COLUMN is not supported for changing column " +
s"'${originColumn.name}' with type '${originColumn.dataType}' to
" +
s"'${newColumn.name}' with type '${newColumn.dataType}'")
--- End diff --
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