gianm opened a new pull request, #18400:
URL: https://github.com/apache/druid/pull/18400
Previously, CaseToCoalesceRule ignored nullability casts when deciding if
"x" and "y" in "CASE WHEN x IS NOT NULL THEN y" match and could therefore form
the basis of a COALESCE. This was too strict, since it considered a cast from
VARCHAR to VARCHAR(2000), which can happen after applying JSON_VALUE, to be
relevant. It is not relevant, because it does not affect how we execute the
query.
This patch updates the logic to ignore nullability casts and also casts that
change irrelevant properties of the type. ("Irrelevant" being defined as
"properties that do not affect how the query executes".)
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