Github user sameeragarwal commented on the issue:
https://github.com/apache/spark/pull/16998
> As we use constraints in optimization, if we turn off constraint
inference/propagation, wouldn't it miss optimization chance for query plans?
Not really. Constraint propagation will still be enabled by default in
Spark. The flag would just be a hammer to quickly get around issues like this
and SPARK-17733.
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