The attached patch cleans up the implementation of the TRUNCATE command;
in the current code, the authentication logic (check user, check the relation we're operating on, etc) is done in tcop/utility.c, whereas the actual TRUNCATE command in done in TruncateRelation() in commands/createinh.c (which is really just a wrapper over heap_truncate() in catalog/heap.c). This patch moves the authentication logic into TruncateRelation(), as well as making some minor code cleanups. Neil Conway
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