Daniël Heres created ARROW-12266:
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Summary: [Rust][DataFusion] Fix null handling hash join
Key: ARROW-12266
URL: https://issues.apache.org/jira/browse/ARROW-12266
Project: Apache Arrow
Issue Type: Bug
Components: Rust - DataFusion
Reporter: Daniël Heres
Assignee: Daniël Heres
Improve null handling of
SELECT id1, id2 FROM (SELECT null AS id1) t1
LEFT JOIN (SELECT 0 AS id2) t2 ON id1 = id2
> NULL, NULL
(should be empty result set)
We should filter beforehand to make this result correct. Also this can make
things more efficient as the non-null filter can be pushed down which can lead
to efficiency gains (making data-set smaller, not having to deal with nullable
data, or even entire files could be skipped when they only contain nulls).
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