RenameRewriteRule, and I defer to Teodor about the gist and gin functions. The others range somewhere between "no" and "hell no".
I think that gistcentryinit() and extractEntriesS() should not be a static.
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TIP 9: In versions below 8.0, the planner will ignore your desire to
choose an index scan if your joining column's datatypes do not
match
