huaxingao commented on code in PR #37031:
URL: https://github.com/apache/spark/pull/37031#discussion_r912501587
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sql/core/src/main/scala/org/apache/spark/sql/jdbc/MySQLDialect.scala:
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@@ -217,7 +219,7 @@ private case object MySQLDialect extends JdbcDialect with
SQLConfHelper {
// The only property we are building here is `COMMENT` because
it's the only one
// we can get from `SHOW INDEXES`.
val properties = new util.Properties();
- if (indexComment.nonEmpty) properties.put("COMMENT", indexComment)
Review Comment:
> maybe we need add some UT for it
Sounds good to me. I will take a look at the new PR.
> Whether it is necessary to implement createIndex & existIndex & dropIndex
& listIndex in H2Dialect ?
It's OK to implement these.
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