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9e98583 introduced a helper to centralize building their needed state (tuplestore, tuple descriptors, etc.), checking for any errors. This commit updates all places of contrib/ that can be switched to use SetSingleFuncCall() as a drop-in replacement, resulting in the removal of a lot of boilerplate code in all the modules updated by this commit. Per analysis, some places remain as they are: - pg_logdir_ls() in adminpack/ uses historically TYPEFUNC_RECORD as return type, and I suspect that changing it may cause issues at run-time with some of its past versions, down to 1.0. - dblink/ uses a wrapper function doing exactly the work of SetSingleFuncCall(). Here the switch should be possible, but rather invasive so it does not seem the extra backpatch maintenance cost. - tablefunc/, similarly, uses multiple helper functions with portions of SetSingleFuncCall() spread across the code paths of this module. Author: Melanie Plageman Discussion: https://postgr.es/m/CAAKRu_bvDPJoL9mH6eYwvBpPtTGQwbDzfJbCM-OjkSZDu5yTPg@mail.gmail.com