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https://issues.apache.org/jira/browse/CALCITE-1543?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15755214#comment-15755214
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Julian Hyde commented on CALCITE-1543:
--------------------------------------
I have a code test case: see
https://github.com/julianhyde/calcite/tree/1543-decorrelate-aggregate-scalar.
> Decorrelator assertion fail
> ---------------------------
>
> Key: CALCITE-1543
> URL: https://issues.apache.org/jira/browse/CALCITE-1543
> Project: Calcite
> Issue Type: Bug
> Reporter: Kurt Young
> Assignee: Julian Hyde
>
> Caused by: java.lang.AssertionError at
> org.apache.calcite.sql2rel.RelDecorrelator.decorrelateRel(RelDecorrelator.java:456)
> The code is:
> {code}
> final Frame frame = getInvoke(oldInput, rel);
> if (frame == null) {
> // If input has not been rewritten, do not rewrite this rel.
> return null;
> }
> assert !frame.corVarOutputPos.isEmpty();
> {code}
> Seems like it's no need to assert the corVarOutputPos because in some cases,
> the correlate has been fully rewritten.
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