Github user chenghao-intel commented on a diff in the pull request:
https://github.com/apache/spark/pull/3249#discussion_r25551740
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/Analyzer.scala
---
@@ -422,6 +424,108 @@ class Analyzer(catalog: Catalog,
Generate(g, join = false, outer = false, None, child)
}
}
+
+ /**
+ * Transforms the query which has subquery expressions in where clause
to left semi join.
+ * select T1.x from T1 where T1.x in (select T2.y from T2) transformed to
+ * select T1.x from T1 left semi join T2 on T1.x = T2.y.
+ */
+ object SubQueryExpressions extends Rule[LogicalPlan] {
+
+ def apply(plan: LogicalPlan): LogicalPlan = plan transform {
+ case p: LogicalPlan if !p.childrenResolved => p
+ case filter @ Filter(conditions, child) =>
--- End diff --
We are not going to handle the non `Subquery` case here right? how about
```
case filter @ Filter(In(expr, SubqueryExpression(subquery)), child) =>
```
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