Github user hvanhovell commented on a diff in the pull request:
https://github.com/apache/spark/pull/16954#discussion_r103406494
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/Analyzer.scala
---
@@ -1398,42 +1399,46 @@ class Analyzer(
}
} while (!current.resolved && !current.fastEquals(previous))
- // Step 2: Pull out the predicates if the plan is resolved.
+ // Step 2: pull the outer references and record them as children of
SubqueryExpression
if (current.resolved) {
// Make sure the resolved query has the required number of output
columns. This is only
// needed for Scalar and IN subqueries.
if (requiredColumns > 0 && requiredColumns != current.output.size)
{
failAnalysis(s"The number of columns in the subquery
(${current.output.size}) " +
s"does not match the required number of columns
($requiredColumns)")
}
- // Pullout predicates and construct a new plan.
- f.tupled(rewriteSubQuery(current, plans))
+ // Validate the outer reference and record the outer references as
children of
+ // subquery expression.
+ f.tupled(current, checkAndGetOuterReferences(current))
--- End diff --
I think we can. The reason I used `f.tupled` was because
`rewriteSubQuery(..)` returned a tuple.
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