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| author | Robert Haas <rhaas@postgresql.org> | 2017-03-09 12:13:48 -0500 |
|---|---|---|
| committer | Robert Haas <rhaas@postgresql.org> | 2017-03-09 12:13:48 -0500 |
| commit | 6a468c343b31aabead7d3a5e11079bfcddbfd667 (patch) | |
| tree | 66cc853132bf226752ed91850859ce53e6e53b5f /src | |
| parent | 0ee92e1c9b570f90d043e5b033a19b67497ea1f6 (diff) | |
| download | postgresql-6a468c343b31aabead7d3a5e11079bfcddbfd667.tar.gz postgresql-6a468c343b31aabead7d3a5e11079bfcddbfd667.zip | |
Fix bug in parallel tidbitmap iteration.
Avoid computing idxpages[istate->spageptr] until after checking
that istate->spageptr is a legal index.
Dilip Kumar, per a report from David Rowley
Discussion: http://postgr.es/m/CAKJS1f8OtrHE+-P+=E=4ycnL29e9idZKuaTQ6o2MbhvGN9D8ig@mail.gmail.com
Diffstat (limited to 'src')
| -rw-r--r-- | src/backend/nodes/tidbitmap.c | 3 |
1 files changed, 1 insertions, 2 deletions
diff --git a/src/backend/nodes/tidbitmap.c b/src/backend/nodes/tidbitmap.c index 44cc9daa03f..8e915646d93 100644 --- a/src/backend/nodes/tidbitmap.c +++ b/src/backend/nodes/tidbitmap.c @@ -1103,13 +1103,12 @@ tbm_shared_iterate(TBMSharedIterator *iterator) if (istate->schunkptr < istate->nchunks) { PagetableEntry *chunk = &ptbase[idxchunks[istate->schunkptr]]; - PagetableEntry *page = &ptbase[idxpages[istate->spageptr]]; BlockNumber chunk_blockno; chunk_blockno = chunk->blockno + istate->schunkbit; if (istate->spageptr >= istate->npages || - chunk_blockno < page->blockno) + chunk_blockno < ptbase[idxpages[istate->spageptr]].blockno) { /* Return a lossy page indicator from the chunk */ output->blockno = chunk_blockno; |