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Change the internal sqlite3WhereBegin() to report that the ORDER BY clause

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is satisfied by indices using the WhereInfo.nOBSat field of the returned
structure.

FossilOrigin-Name: 22989f3588531efd555cc29d6c576e7a34b7edc4
This commit is contained in:
drh
2012-09-24 15:30:54 +00:00
parent 86ae51c991
commit 46ec5b63e2
5 changed files with 47 additions and 46 deletions
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32
src/sqliteInt.h
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@@ -1982,20 +1982,21 @@ struct WhereLevel {
** into the second half to give some continuity.
*/
struct WhereInfo {
Parse *pParse; /* Parsing and code generating context */
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; /* One of the WHERE_DISTINCT_* values below */
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 */
int iBreak; /* Jump here to break out of the loop */
int nLevel; /* Number of nested loop */
struct WhereClause *pWC; /* Decomposition of the WHERE clause */
double savedNQueryLoop; /* pParse->nQueryLoop outside the WHERE loop */
double nRowOut; /* Estimated number of output rows */
WhereLevel a[1]; /* Information about each nest loop in WHERE */
Parse *pParse; /* Parsing and code generating context */
SrcList *pTabList; /* List of tables in the join */
u16 nOBSat; /* Number of ORDER BY terms satisfied by indices */
u16 wctrlFlags; /* Flags originally passed to sqlite3WhereBegin() */
u8 okOnePass; /* Ok to use one-pass algorithm for UPDATE/DELETE */
u8 untestedTerms; /* Not all WHERE terms resolved by outer loop */
u8 eDistinct; /* One of the WHERE_DISTINCT_* values below */
int iTop; /* The very beginning of the WHERE loop */
int iContinue; /* Jump here to continue with next record */
int iBreak; /* Jump here to break out of the loop */
int nLevel; /* Number of nested loop */
struct WhereClause *pWC; /* Decomposition of the WHERE clause */
double savedNQueryLoop; /* pParse->nQueryLoop outside the WHERE loop */
double nRowOut; /* Estimated number of output rows */
WhereLevel a[1]; /* Information about each nest loop in WHERE */
};
/* Allowed values for WhereInfo.eDistinct and DistinctCtx.eTnctType */
@@ -2811,8 +2812,7 @@ 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**,ExprList*,u16,int);
WhereInfo *sqlite3WhereBegin(Parse*,SrcList*,Expr*,ExprList*,ExprList*,u16,int);
void sqlite3WhereEnd(WhereInfo*);
int sqlite3ExprCodeGetColumn(Parse*, Table*, int, int, int, u8);
void sqlite3ExprCodeGetColumnOfTable(Vdbe*, Table*, int, int, int);