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Reset the binary heap in MergeAppend rescans.

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Failing to do so can cause queries to return wrong data, error out or crash.
This requires adding a new binaryheap_reset() method to binaryheap.c,
but that probably should have been there anyway.

Per bug #8410 from Terje Elde.  Diagnosis and patch by Andres Freund.
This commit is contained in:
Tom Lane
2013-08-30 19:15:21 -04:00
parent dfed97b744
commit 16e8e36ceb
3 changed files with 19 additions and 3 deletions
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src/include/lib/binaryheap.h
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@@ -40,6 +40,7 @@ typedef struct binaryheap
extern binaryheap *binaryheap_allocate(int capacity,
binaryheap_comparator compare,
void *arg);
extern void binaryheap_reset(binaryheap *heap);
extern void binaryheap_free(binaryheap *heap);
extern void binaryheap_add_unordered(binaryheap *heap, Datum d);
extern void binaryheap_build(binaryheap *heap);