0dab5ef39b
Fix an oversight in commit 321eed5f0f7563a0: replacing an operator's selectivity functions needs to result in a corresponding update in pg_depend. We have a function that can handle that, but it was not called by AlterOperator(). To fix this without enlarging pg_operator.h's #include list beyond what clients can safely include, split off the function definitions into a new file pg_operator_fn.h, similarly to what we've done for some other catalog header files. It's not entirely clear whether any client-side code needs to include pg_operator.h, but it seems prudent to assume that there is some such code somewhere.
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