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Add the BtCursor.curIntKey field and use it for a small size reduction and

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performance boost.

FossilOrigin-Name: 4a17df139ac41e29c9a2e58afbd1238a5e94bd36
This commit is contained in:
drh
2015-06-27 22:49:10 +00:00
parent 15a0021b3e
commit 408efc0664
4 changed files with 17 additions and 12 deletions
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10
src/btreeInt.h
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@@ -508,7 +508,6 @@ struct BtCursor {
Btree *pBtree; /* The Btree to which this cursor belongs */
BtShared *pBt; /* The BtShared this cursor points to */
BtCursor *pNext, *pPrev; /* Forms a linked list of all cursors */
struct KeyInfo *pKeyInfo; /* Argument passed to comparison function */
Pgno *aOverflow; /* Cache of overflow page locations */
CellInfo info; /* A parse of the cell we are pointing at */
i64 nKey; /* Size of pKey, or last integer key */
@@ -520,8 +519,13 @@ struct BtCursor {
u8 curFlags; /* zero or more BTCF_* flags defined below */
u8 curPagerFlags; /* Flags to send to sqlite3PagerAcquire() */
u8 eState; /* One of the CURSOR_XXX constants (see below) */
u8 hints; /* As configured by CursorSetHints() */
i16 iPage; /* Index of current page in apPage */
u8 hints; /* As configured by CursorSetHints() */
/* All fields above are zeroed when the cursor is allocated. See
** sqlite3BtreeCursorZero(). Fields that follow must be manually
** initialized. */
i8 iPage; /* Index of current page in apPage */
u8 curIntKey; /* Value of apPage[0]->intKey */
struct KeyInfo *pKeyInfo; /* Argument passed to comparison function */
u16 aiIdx[BTCURSOR_MAX_DEPTH]; /* Current index in apPage[i] */
MemPage *apPage[BTCURSOR_MAX_DEPTH]; /* Pages from root to current page */
};