mahesh kumar behera created SPARK-44307:
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Summary: Bloom filter is not added for left outer join if the left
side table is smaller than broadcast threshold.
Key: SPARK-44307
URL: https://issues.apache.org/jira/browse/SPARK-44307
Project: Spark
Issue Type: Bug
Components: Optimizer
Affects Versions: 3.4.1
Reporter: mahesh kumar behera
Fix For: 3.5.0
In case of left outer join, even if the left side table is small enough to be
broadcasted, shuffle join is used. This is because of the property of the left
outer join. If the left side is broadcasted in left outer join, the result
generated will be wrong. But this is not taken care of in bloom filter. While
injecting the bloom filter, if lest side is smaller than broadcast threshold,
bloom filter is not added. It assumes that the left side will be broadcast and
there is no need for a bloom filter. This causes bloom filter optimization to
be missed in case of left outer join with small left side and huge right-side
table.
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