diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/include/access/gin_private.h | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/src/include/access/gin_private.h b/src/include/access/gin_private.h index 77f5ffd4bf0..93743df6b8e 100644 --- a/src/include/access/gin_private.h +++ b/src/include/access/gin_private.h @@ -226,10 +226,18 @@ typedef signed char GinNullCategory; #define GinGetPosting(itup) ((Pointer) ((char*)(itup) + GinGetPostingOffset(itup))) #define GinItupIsCompressed(itup) (GinItemPointerGetBlockNumber(&(itup)->t_tid) & GIN_ITUP_COMPRESSED) +/* + * Maximum size of an item on entry tree page. Make sure that we fit at least + * three items on each page. (On regular B-tree indexes, we must fit at least + * three items: two data items and the "high key". In GIN entry tree, we don't + * currently store the high key explicitly, we just use the rightmost item on + * the page, so it would actually be enough to fit two items.) + */ #define GinMaxItemSize \ Min(INDEX_SIZE_MASK, \ - MAXALIGN_DOWN(((BLCKSZ - SizeOfPageHeaderData - \ - MAXALIGN(sizeof(GinPageOpaqueData))) / 6 - sizeof(ItemIdData)))) + MAXALIGN_DOWN(((BLCKSZ - \ + MAXALIGN(SizeOfPageHeaderData + 3 * sizeof(ItemIdData)) - \ + MAXALIGN(sizeof(GinPageOpaqueData))) / 3))) /* * Access macros for non-leaf entry tuples |