"Regina Obe" <l...@pcorp.us> writes:
> I figured out the culprit was the change in CASE WHEN behavior with set
> returning functions
> Had a criteria something of the form:
> CASE WHEN some_condition_dependent_on_sometable_that_resolves_to_false THEN
> (regexp_matches(...))[1] ELSE ...  END
> FROM sometable;

You might want to consider changing such usages to use regexp_match()
instead of regexp_matches().

                        regards, tom lane

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