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release-19.1: opt: nil presentation should not equal the 0-column presentation #41667

Merged
merged 1 commit into from
Oct 17, 2019
Merged

release-19.1: opt: nil presentation should not equal the 0-column presentation #41667

merged 1 commit into from
Oct 17, 2019

Commits on Oct 17, 2019

  1. opt: nil presentation should not equal the 0-column presentation 

    The nil presentation means that we want all columns in no particular
order, whereas the 0-column presentation means that we don't need any
of the columns (e.g. EXISTS subqueries). Only the nil presentation
is `Any()`. But `Equals()` was incorrectly treating these as equal.
This confused the interner and a nil presentation became a 0-column
presentation which led to some internal errors in Apply.

For completeness, we also fix `HashPhysProps` to differentiate
between these two, but note that this isn't required for correctness.

Fixes cockroachdb#39435.

Release note (bug fix): Fixed internal errors generated during
execution of some complicated cases of correlated subqueries.
    @RaduBerinde
    RaduBerinde committed Oct 17, 2019
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