Github user gatorsmile commented on a diff in the pull request: https://github.com/apache/spark/pull/12255#discussion_r59099567 --- Diff: sql/core/src/main/scala/org/apache/spark/sql/execution/SparkSqlParser.scala --- @@ -206,7 +203,7 @@ class SparkSqlAstBuilder extends AstBuilder { override def visitCreateTableUsing(ctx: CreateTableUsingContext): LogicalPlan = withOrigin(ctx) { val (table, temp, ifNotExists, external) = visitCreateTableHeader(ctx.createTableHeader) if (external) { - logWarning("EXTERNAL option is not supported.") + throw new ParseException("Unsupported operation: EXTERNAL option", ctx) --- End diff -- I see. Then, we should check the values in `Option` to determine if users should specify `EXTERNAL`? If it does not match, we should issue an exception?
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