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The benefit of SqlValidatorImpl#performUnconditionalRewrites


I'm trying to understand when would this method
<https://github.com/apache/calcite/blob/master/core/src/main/java/org/apache/calcite/sql/validate/SqlValidatorImpl.java#L1104>
be useful but I couldn't. Would someone please clarify the benefit of
executing this method ?

Or at least provide a query that would be changed after invoking this
method and I would debug through it to understand what modifications are
done ?

Thanks,
Gelbana