diff options
| author | Tom Lane <tgl@sss.pgh.pa.us> | 2013-11-15 18:34:14 -0500 |
|---|---|---|
| committer | Tom Lane <tgl@sss.pgh.pa.us> | 2013-11-15 18:34:34 -0500 |
| commit | 32b32845e05c4dfe0862c89d12e0cacef4e018bb (patch) | |
| tree | 10b8d1c03f149d6934d091aaad7a23c8828b41f3 /src/backend/nodes/tidbitmap.c | |
| parent | 1821ef15bd063fdfd0073dff7b18fa7f0d639554 (diff) | |
Fix incorrect loop counts in tidbitmap.c.
A couple of places that should have been iterating over WORDS_PER_CHUNK
words were iterating over WORDS_PER_PAGE words instead. This thinko
accidentally failed to fail, because (at least on common architectures
with default BLCKSZ) WORDS_PER_CHUNK is a bit less than WORDS_PER_PAGE,
and the extra words being looked at were always zero so nothing happened.
Still, it's a bug waiting to happen if anybody ever fools with the
parameters affecting TIDBitmap sizes, and it's a small waste of cycles
too. So back-patch to all active branches.
Etsuro Fujita
Diffstat (limited to 'src/backend/nodes/tidbitmap.c')
| -rw-r--r-- | src/backend/nodes/tidbitmap.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/src/backend/nodes/tidbitmap.c b/src/backend/nodes/tidbitmap.c index 54d8028da01..123e9c37e14 100644 --- a/src/backend/nodes/tidbitmap.c +++ b/src/backend/nodes/tidbitmap.c @@ -362,7 +362,7 @@ tbm_union_page(TIDBitmap *a, const PagetableEntry *bpage) if (bpage->ischunk) { /* Scan b's chunk, mark each indicated page lossy in a */ - for (wordnum = 0; wordnum < WORDS_PER_PAGE; wordnum++) + for (wordnum = 0; wordnum < WORDS_PER_CHUNK; wordnum++) { bitmapword w = bpage->words[wordnum]; @@ -474,7 +474,7 @@ tbm_intersect_page(TIDBitmap *a, PagetableEntry *apage, const TIDBitmap *b) /* Scan each bit in chunk, try to clear */ bool candelete = true; - for (wordnum = 0; wordnum < WORDS_PER_PAGE; wordnum++) + for (wordnum = 0; wordnum < WORDS_PER_CHUNK; wordnum++) { bitmapword w = apage->words[wordnum]; |