[GitHub] [spark] huaxingao commented on a change in pull request #35355: [SPARK-38054][SQL] DS V2 supports list namespaces of MySQL dialect

[GitBox <gi...@apache.org>]

huaxingao commented on a change in pull request #35355:
URL: https://github.com/apache/spark/pull/35355#discussion_r800325893



##########
File path: sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/jdbc/JdbcUtils.scala
##########
@@ -979,8 +979,23 @@ object JdbcUtils extends Logging with SQLConfHelper {
       namespace: String,
       comment: String): Unit = {
     val dialect = JdbcDialects.get(options.url)
+    val schemaCommentQuery = if (comment.isEmpty) {
+      comment
+    } else {
+      dialect.getSchemaCommentQuery(namespace, comment)
+    }
     executeStatement(conn, options, s"CREATE SCHEMA ${dialect.quoteIdentifier(namespace)}")
-    if (!comment.isEmpty) createNamespaceComment(conn, options, namespace, comment)
+    if (comment.nonEmpty) executeStatement(conn, options, schemaCommentQuery)

Review comment:
       I guess
   ```
       val dialect = JdbcDialects.get(options.url)
       executeStatement(conn, options, s"CREATE SCHEMA ${dialect.quoteIdentifier(namespace)}")
       if (comment.nonEmpty) {
         executeStatement(conn, options, dialect.getSchemaCommentQuery(namespace, comment))
       }
   ```




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