Feature: ON DUPLICATE UPDATE x=IF(x < VALUES(x), VALUES(x), x)
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This PR introduces a new conditional update tailored specifically for the situation when we need to update a field only if the new value is greater than existing one.
See test for more details on how it works.
Minor thing:
Mainmodule for test suite was updated withFlexibleContextsextension because otherwise it won't compile (ghc 9.8.4)