Github user davies commented on a diff in the pull request:
https://github.com/apache/spark/pull/13155#discussion_r64491862
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala
---
@@ -1695,16 +1695,176 @@ object RewriteCorrelatedScalarSubquery extends
Rule[LogicalPlan] {
}
/**
+ * Statically evaluate an expression containing zero or more
placeholders, given a set
+ * of bindings for placeholder values.
+ */
+ private def evalExpr(expr : Expression, bindings : Map[Long,
Option[Any]]) : Option[Any] = {
--- End diff --
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