Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/15717#discussion_r92329570
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/SparkSqlParser.scala ---
@@ -877,6 +877,35 @@ class SparkSqlAstBuilder(conf: SQLConf) extends
AstBuilder {
}
/**
+ * Create a [[AlterTableChangeColumnsCommand]] command.
+ *
+ * For example:
+ * {{{
+ * ALTER TABLE table [PARTITION partition_spec]
+ * CHANGE [COLUMN] `col` `col` dataType [COMMENT "comment"] [FIRST |
AFTER `otherCol`]
+ * [, `col2` `col2` dataType [COMMENT "comment"] [FIRST | AFTER
`otherCol`], ...]
--- End diff --
What is the reason do we allow users to modify multiple columns in the same
DDL? This is different from what Hive supports. Should we do it? cc @cloud-fan
In addition, based on the existing syntax, if we really want to support
multiple columns, we should change the keywords to `CHANGE COLUMNS`.
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