cloud-fan commented on a change in pull request #34148:
URL: https://github.com/apache/spark/pull/34148#discussion_r728859873
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File path: sql/core/src/main/scala/org/apache/spark/sql/jdbc/MySQLDialect.scala
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@@ -128,7 +128,7 @@ private case object MySQLDialect extends JdbcDialect with
SQLConfHelper {
indexProperties = indexProperties + " " + s"$k $v"
}
}
- val iType = if (indexType.isEmpty) {
+ val iType = if (indexType == null || indexType.isEmpty) {
Review comment:
or we can follow table provider and define a reserved index property key
like `index_type`. If `USING index_type` is not specified, we don't put this
key in the index properties.
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