From: Rod Taylor on
Is there any particular reason why the citext module doesn't have
citext_pattern_ops operator family?

Specifically, I wish to index for this type of query:

.... WHERE citext_column LIKE 'Foo%';

This, of course, is equivalent to ILIKE 'Foo%' which does not appear
to be indexable without using a functional index (
lower(citext_column) ).

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