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This module overlooked this necessary fixup step on the results of transformWhereClause(). It accidentally worked anyway, because the constructed expression involved type "name" which is not collatable, but it fell over while I was experimenting with changing "name" to be collatable. Back-patch, not because there's any live bug here in back branches, but because somebody might use this code as a model for some real application and then not understand why it doesn't work.
Test extensions and libraries ============================= src/test/modules contains PostgreSQL extensions that are primarily or entirely intended for testing PostgreSQL and/or to serve as example code. The extensions here aren't intended to be installed in a production server and aren't suitable for "real work". Most extensions have their own pg_regress tests or isolationtester specs. Some are also used by tests elsewhere in the tree. If you're adding new hooks or other functionality exposed as C-level API this is where to add the tests for it.