0339047bc9
Fix loss of previous expression-simplification work when a transform function fires: we must not simply revert to untransformed input tree. Instead build a dummy FuncExpr node to pass to the transform function. This has the additional advantage of providing a simpler, more uniform API for transform functions. Move documentation to a somewhat less buried spot, relocate some poorly-placed code, be more wary of null constants and invalid typmod values, add an opr_sanity check on protransform function signatures, and some other minor cosmetic adjustments. Note: although this patch touches pg_proc.h, no need for catversion bump, because the changes are cosmetic and don't actually change the intended catalog contents. |
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