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Julian Hyde commented on CALCITE-1045: -------------------------------------- Work in progress at https://github.com/julianhyde/calcite/tree/1045-correlated-project. > 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). -- This message was sent by Atlassian JIRA (v6.3.4#6332)