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Commitf1f21b2

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Fix incorrect loop counts in tidbitmap.c.
A couple of places that should have been iterating over WORDS_PER_CHUNKwords were iterating over WORDS_PER_PAGE words instead. This thinkoaccidentally failed to fail, because (at least on common architectureswith 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 theparameters affecting TIDBitmap sizes, and it's a small waste of cyclestoo. So back-patch to all active branches.Etsuro Fujita
1 parent97e1ec4 commitf1f21b2

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‎src/backend/nodes/tidbitmap.c

Lines changed: 2 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -361,7 +361,7 @@ tbm_union_page(TIDBitmap *a, const PagetableEntry *bpage)
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if (bpage->ischunk)
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{
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/* Scan b's chunk, mark each indicated page lossy in a */
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for (wordnum=0;wordnum<WORDS_PER_PAGE;wordnum++)
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for (wordnum=0;wordnum<WORDS_PER_CHUNK;wordnum++)
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{
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bitmapwordw=bpage->words[wordnum];
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@@ -473,7 +473,7 @@ tbm_intersect_page(TIDBitmap *a, PagetableEntry *apage, const TIDBitmap *b)
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/* Scan each bit in chunk, try to clear */
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boolcandelete= true;
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for (wordnum=0;wordnum<WORDS_PER_PAGE;wordnum++)
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for (wordnum=0;wordnum<WORDS_PER_CHUNK;wordnum++)
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{
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bitmapwordw=apage->words[wordnum];
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