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Experimental changes to improve optimization of DISTINCT queries.

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FossilOrigin-Name: f7ba0219ef2f235543c258be736955d91ca5ecce
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dan
2011-06-30 20:17:15 +00:00
parent e1b4f0f177
commit 38cc40c216
14 changed files with 219 additions and 66 deletions
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6
src/sqliteInt.h
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@@ -1966,6 +1966,7 @@ struct WhereInfo {
u16 wctrlFlags; /* Flags originally passed to sqlite3WhereBegin() */
u8 okOnePass; /* Ok to use one-pass algorithm for UPDATE or DELETE */
u8 untestedTerms; /* Not all WHERE terms resolved by outer loop */
u8 eDistinct;
SrcList *pTabList; /* List of tables in the join */
int iTop; /* The very beginning of the WHERE loop */
int iContinue; /* Jump here to continue with next record */
@@ -1977,6 +1978,9 @@ struct WhereInfo {
WhereLevel a[1]; /* Information about each nest loop in WHERE */
};
#define WHERE_DISTINCT_UNIQUE 1
#define WHERE_DISTINCT_ORDERED 2
/*
** A NameContext defines a context in which to resolve table and column
** names. The context consists of a list of tables (the pSrcList) field and
@@ -2738,7 +2742,7 @@ Expr *sqlite3LimitWhere(Parse *, SrcList *, Expr *, ExprList *, Expr *, Expr *,
#endif
void sqlite3DeleteFrom(Parse*, SrcList*, Expr*);
void sqlite3Update(Parse*, SrcList*, ExprList*, Expr*, int);
WhereInfo *sqlite3WhereBegin(Parse*, SrcList*, Expr*, ExprList**, u16);
WhereInfo *sqlite3WhereBegin(Parse*, SrcList*, Expr*, ExprList**,ExprList*,u16);
void sqlite3WhereEnd(WhereInfo*);
int sqlite3ExprCodeGetColumn(Parse*, Table*, int, int, int);
void sqlite3ExprCodeGetColumnOfTable(Vdbe*, Table*, int, int, int);