I think that TupIsNull macro is no longer appropriate, to protect ExecCopySlot.
See at tuptable.h: #define TupIsNull(slot) \ ((slot) == NULL || TTS_EMPTY(slot)) If var node->group_pivot is NULL, ExecCopySlot will dereference a null pointer (first arg). Maybe, this can be related to a bug reported in the btree deduplication. regards, Ranier Vilela
avoid_dereferencing_null_pointer.patch
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