Github user hvanhovell commented on a diff in the pull request:
https://github.com/apache/spark/pull/7515#discussion_r35946650
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/Analyzer.scala
---
@@ -818,7 +818,8 @@ class Analyzer(
failAnalysis(s"$expr has multiple Window Specifications
($distinctWindowSpec)." +
s"Please file a bug report with this error message, stack
trace, and the query.")
} else {
- distinctWindowSpec.head
+ val unbounded = SpecifiedWindowFrame(RowFrame,
UnboundedPreceding, UnboundedFollowing)
--- End diff --
I think extracting the grouping by and order by clauses is better, and it
also conveys the message that any Window operator should be capable of
processing multiple frames. The impact of the PR will be a bit larger in that
case; I'll have a look at it tomorrow.
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