Julian Hyde created CALCITE-1045:
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Summary: Decorrelate sub-queries in Project and Join
Key: CALCITE-1045
URL: https://issues.apache.org/jira/browse/CALCITE-1045
Project: Calcite
Issue Type: Bug
Reporter: Julian Hyde
Assignee: Julian Hyde
In CALCITE-816 we created a representation of sub-query in the relational
algebra, RexSubQuery, so that we could defer expanding and de-correlating
sub-queries until after SqlNode tree has been converted to RelNode tree. But
the RelDecorrelator can only reliably handle sub-queries that occur in a Filter
(such as WHERE EXISTS or WHERE IN).
This task would except RelDecorrelator to handle sub-queries in Project (which
occur with scalar sub-queries in the SELECT clause) and sub-queries in Join
(which occur with scalar sub-queries in the ON clause of a JOIN).
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