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Commit57d3dc2

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gistendscan() forgot to free so->giststate.
This oversight led to a massive memory leak --- upwards of 10KB per tuple--- during creation-time verification of an exclusion constraint based on aGIST index. In most other scenarios it'd just be a leak of 10KB that wouldbe recovered at end of query, so not too significant; though perhaps theleak would be noticeable in a situation where a GIST index was being usedin a nestloop inner indexscan. In any case, it's a real leak of longstanding, so patch all supported branches. Per report from Harald Fuchs.
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‎src/backend/access/gist/gistscan.c

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@@ -242,6 +242,7 @@ gistendscan(PG_FUNCTION_ARGS)
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GISTScanOpaqueso= (GISTScanOpaque)scan->opaque;
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freeGISTstate(so->giststate);
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pfree(so->giststate);
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MemoryContextDelete(so->queueCxt);
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MemoryContextDelete(so->tempCxt);
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pfree(so->tmpTreeItem);

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