Github user viirya commented on a diff in the pull request:
https://github.com/apache/spark/pull/19050#discussion_r135385366
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/subquery.scala
---
@@ -98,6 +99,11 @@ object RewritePredicateSubquery extends
Rule[LogicalPlan] with PredicateHelper {
val (newCond, inputPlan) =
rewriteExistentialExpr(Seq(predicate), p)
Project(p.output, Filter(newCond.get, inputPlan))
}
+
+ rewrotePlan transform {
+ case j @ Join(left, right, _, _) if !j.duplicateResolved =>
+ j.copy(right = DedupQueryAttributesInPlans.dedupRight(left,
right))
--- End diff --
One example:
Seq(1 -> "a").toDF("i", "j").write.parquet(path.getCanonicalPath)
sql(s"CREATE TABLE t1 USING parquet LOCATION '${path.toURI}'")
val sqlText =
"""
|SELECT * FROM t1
|WHERE
|NOT EXISTS (SELECT * FROM t1)
""".stripMargin
val ds = sql(sqlText)
println(ds.queryExecution.analyzed)
println(ds.queryExecution.optimizedPlan)
Project [i#236, j#237]
+- Filter NOT exists#235 []
: +- Project [i#236, j#237]
: +- SubqueryAlias t1
: +- Relation[i#236,j#237] parquet
+- SubqueryAlias t1
+- Relation[i#236,j#237] parquet
'Join LeftAnti
:- Relation[i#236,j#237] parquet
+- Relation[i#236,j#237] parquet
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