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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