Github user liancheng commented on a diff in the pull request: https://github.com/apache/spark/pull/11148#discussion_r52728653 --- Diff: sql/hive/src/main/scala/org/apache/spark/sql/hive/SQLBuilder.scala --- @@ -119,6 +120,18 @@ class SQLBuilder(logicalPlan: LogicalPlan, sqlContext: SQLContext) extends Loggi limitSQL = limit.sql } yield s"$childSQL LIMIT $limitSQL" + // TABLESAMPLE is part of tableSource clause in the parser, + // and thus we must handle it with subquery. + case Sample(lb, ub, withReplacement, _, child @ Subquery(alias, grandChild)) --- End diff -- Agree with @rxin. Especially, I don't think `MetastoreRelation` is wrapped by a `Subquery` in this case.
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