... has this comment (fmgr.h:506): /* These are for invocation of a function identified by OID with a * directly-computed parameter list. Note that neither arguments nor result * are allowed to be NULL. These are essentially FunctionLookup() followed * by FunctionCallN(). If the same function is to be invoked repeatedly, * do the FunctionLookup() once and then use FunctionCallN(). */
However, there doesn't appear to be any such animal as FunctionLookup(). Shouldn't it say fmgr_info() instead?
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