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  1. Calcite
  2. CALCITE-1045

Decorrelate sub-queries in Project and Join

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    • Bug
    • Status: Open
    • Major
    • Resolution: Unresolved
    • None
    • None
    • None

    Description

      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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              Unassigned Unassigned
              julianhyde Julian Hyde
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