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Enhance the automatic index logic so that it creates a partial index when

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doing so gives the same answer for less work.

FossilOrigin-Name: d95d0313c447f5baeabdb17284d8606331ab7d49
This commit is contained in:
drh
2014-10-24 19:28:09 +00:00
parent 4dd96a8315
commit 059b2d50e1
7 changed files with 143 additions and 47 deletions
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5
src/sqliteInt.h
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@@ -2892,9 +2892,11 @@ struct Walker {
void (*xSelectCallback2)(Walker*,Select*);/* Second callback for SELECTs */
Parse *pParse; /* Parser context. */
int walkerDepth; /* Number of subqueries */
u8 eCode; /* A small processing code */
union { /* Extra data for callback */
NameContext *pNC; /* Naming context */
int i; /* Integer value */
int n; /* A counter */
int iCur; /* A cursor number */
SrcList *pSrcList; /* FROM clause */
struct SrcCount *pSrcCount; /* Counting column references */
} u;
@@ -3295,6 +3297,7 @@ void sqlite3LeaveMutexAndCloseZombie(sqlite3*);
int sqlite3ExprIsConstant(Expr*);
int sqlite3ExprIsConstantNotJoin(Expr*);
int sqlite3ExprIsConstantOrFunction(Expr*, u8);
int sqlite3ExprIsTableConstant(Expr*,int);
int sqlite3ExprIsInteger(Expr*, int*);
int sqlite3ExprCanBeNull(const Expr*);
int sqlite3ExprNeedsNoAffinityChange(const Expr*, char);