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Initial implementation of the unlikely() SQL function used as a hint to

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the query planner.

FossilOrigin-Name: 036fc37a034093a4c6fc190633bd41c2b7230d77
This commit is contained in:
drh
2013-09-06 15:23:29 +00:00
parent d36e104112
commit cca9f3d291
8 changed files with 118 additions and 31 deletions
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5
src/sqliteInt.h
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@@ -1752,7 +1752,8 @@ struct Expr {
#endif
int iTable; /* TK_COLUMN: cursor number of table holding column
** TK_REGISTER: register number
** TK_TRIGGER: 1 -> new, 0 -> old */
** TK_TRIGGER: 1 -> new, 0 -> old
** EP_Hint: 1000 times likelihood */
ynVar iColumn; /* TK_COLUMN: column index. -1 for rowid.
** TK_VARIABLE: variable number (always >= 1). */
i16 iAgg; /* Which entry in pAggInfo->aCol[] or ->aFunc[] */
@@ -1780,7 +1781,7 @@ struct Expr {
#define EP_FixedDest 0x0200 /* Result needed in a specific register */
#define EP_IntValue 0x0400 /* Integer value contained in u.iValue */
#define EP_xIsSelect 0x0800 /* x.pSelect is valid (otherwise x.pList is) */
#define EP_Hint 0x1000 /* Not used */
#define EP_Hint 0x1000 /* The UNLIKELY() SQL function */
#define EP_Reduced 0x2000 /* Expr struct is EXPR_REDUCEDSIZE bytes only */
#define EP_TokenOnly 0x4000 /* Expr struct is EXPR_TOKENONLYSIZE bytes only */
#define EP_Static 0x8000 /* Held in memory not obtained from malloc() */