GitHub user maryannxue opened a pull request:
https://github.com/apache/spark/pull/20805
SPARK-21479 Outer join filter pushdown in null supplying table when
condition is on one of the joined columns
## What changes were proposed in this pull request?
In left/right outer joins, constraints derived from the preserved side can
be propagated to the null-supplying side (not the other way around). Meanwhile,
we do not want to include the join condition in the constraints set since this
is an outer join and otherwise is-not-null constraints would be inferred
incorrectly.
1. Add method QueryPlanConstraints#additionalValidConstraintsForInference
to accommodate this requirement from the Join operator.
2. Override QueryPlanConstraints#additionalValidConstraintsForInference in
the Join operator.
## How was this patch tested?
1. Added 3 new tests in InferFiltersFromConstraintsSuite.
2. Updated 1 test reference in ConstraintsSuitePropagationSuite.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/maryannxue/spark spark-21479
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/20805.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #20805
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commit deb4719ee26494c4c097083a8b4079908a0d44c8
Author: maryannxue <maryann.xue@...>
Date: 2018-03-12T21:06:27Z
SPARK-21479 Outer join filter pushdown in null supplying table when
condition is on one of the joined columns
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