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Minor GIN code refactoring.

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It makes for cleaner code to have separate Get/Add functions for PostingItems
and ItemPointers.  A few callsites that have to deal with both types need to
be duplicated because of this, but all the callers have to know which one
they're dealing with anyway. Overall, this reduces the amount of casting
required.

Extracted from Alexander Korotkov's larger patch to change the data page
format.
This commit is contained in:
Heikki Linnakangas
2013-10-03 11:47:17 +03:00
parent 627882d0d8
commit c2b175b948
5 changed files with 123 additions and 55 deletions
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11
src/include/access/gin_private.h
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@@ -232,10 +232,14 @@ typedef signed char GinNullCategory;
#define GinDataPageGetRightBound(page) ((ItemPointer) PageGetContents(page))
#define GinDataPageGetData(page) \
(PageGetContents(page) + MAXALIGN(sizeof(ItemPointerData)))
/* non-leaf pages contain PostingItems */
#define GinDataPageGetPostingItem(page, i) \
((PostingItem *) (GinDataPageGetData(page) + ((i)-1) * sizeof(PostingItem)))
/* leaf pages contain ItemPointers */
#define GinDataPageGetItemPointer(page, i) \
((ItemPointer) (GinDataPageGetData(page) + ((i)-1) * sizeof(ItemPointerData)))
#define GinSizeOfDataPageItem(page) \
(GinPageIsLeaf(page) ? sizeof(ItemPointerData) : sizeof(PostingItem))
#define GinDataPageGetItem(page,i) \
(GinDataPageGetData(page) + ((i)-1) * GinSizeOfDataPageItem(page))
#define GinDataPageGetFreeSpace(page) \
(BLCKSZ - MAXALIGN(SizeOfPageHeaderData) \
@@ -534,7 +538,8 @@ extern uint32 ginMergeItemPointers(ItemPointerData *dst,
ItemPointerData *a, uint32 na,
ItemPointerData *b, uint32 nb);
extern void GinDataPageAddItem(Page page, void *data, OffsetNumber offset);
extern void GinDataPageAddItemPointer(Page page, ItemPointer data, OffsetNumber offset);
extern void GinDataPageAddPostingItem(Page page, PostingItem *data, OffsetNumber offset);
extern void GinPageDeletePostingItem(Page page, OffsetNumber offset);
typedef struct