Fabian Hueske created FLINK-10474:
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Summary: Don't translate IN to JOIN with VALUES for streaming
queries
Key: FLINK-10474
URL: https://issues.apache.org/jira/browse/FLINK-10474
Project: Flink
Issue Type: Improvement
Components: Table API & SQL
Affects Versions: 1.6.1, 1.7.0
Reporter: Fabian Hueske
IN clauses are translated to JOIN with VALUES if the number of elements in the
IN clause exceeds a certain threshold. This should not be done, because a
streaming join is very heavy and materializes both inputs (which is fine for
the VALUES) input but not for the other.
There are two ways to solve this:
# don't translate IN to a JOIN at all
# translate it to a JOIN but have a special join strategy if one input is
bound and final (non-updating)
Option 1. should be easy to do, option 2. requires much more effort.
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