Github user jiangxb1987 commented on a diff in the pull request:
https://github.com/apache/spark/pull/20696#discussion_r171285332
--- Diff:
sql/core/src/test/scala/org/apache/spark/sql/execution/command/DDLSuite.scala
---
@@ -1597,6 +1597,7 @@ abstract class DDLSuite extends QueryTest with
SQLTestUtils {
// Ensure that change column will preserve other metadata fields.
sql("ALTER TABLE dbx.tab1 CHANGE COLUMN col1 col1 INT COMMENT 'this is
col1'")
assert(getMetadata("col1").getString("key") == "value")
+ assert(getMetadata("col1").getString("comment") == "this is col1")
--- End diff --
I didn't verify the comment is correctly set to the column metadata, and
that caused the issue. :(
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