Github user marmbrus commented on a diff in the pull request: https://github.com/apache/spark/pull/4617#discussion_r24776531 --- Diff: sql/core/src/main/scala/org/apache/spark/sql/sources/rules.scala --- @@ -74,3 +74,68 @@ private[sql] object PreInsertCastAndRename extends Rule[LogicalPlan] { } } } + +/** + * A rule to do various checks before inserting into or writing to a data source table. + */ +private[sql] case class PreWriteCheck(catalog: Catalog) extends Rule[LogicalPlan] { + def failAnalysis(msg: String) = { throw new AnalysisException(msg) } + + def apply(plan: LogicalPlan): LogicalPlan = { + plan.foreach { + case i @ logical.InsertIntoTable( + l @ LogicalRelation(t: InsertableRelation), partition, query, overwrite) => + // Right now, we do not support insert into a data source table with partition specs. + if (partition.nonEmpty) { + failAnalysis(s"Insert into a partition is not allowed because $l is not partitioned.") + } else { + // Get all input data source relations of the query. + val srcRelations = query.collect { + case LogicalRelation(src: BaseRelation) => src + } + if (srcRelations.exists(src => src == t)) { + failAnalysis( + s"It is not allowed to insert overwrite the table because it is used as " + + s"an input table.") --- End diff -- `Cannot insert overwrite into table that is also being read from`
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