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When estimating the cost of an index scan, factor in the cost savings of

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being able to use the index to evaluate some WHERE clause terms without
having to do a table lookup.

FossilOrigin-Name: a59b5622f7cc6e502d71aabc12c053582cd03609
This commit is contained in:
drh
2016-07-27 18:27:02 +00:00
parent 2900a6222f
commit 2409f8a112
5 changed files with 96 additions and 13 deletions
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src/sqliteInt.h
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@@ -3257,6 +3257,7 @@ struct Walker {
struct SrcCount *pSrcCount; /* Counting column references */
struct CCurHint *pCCurHint; /* Used by codeCursorHint() */
int *aiCol; /* array of column indexes */
struct IdxCover *pIdxCover; /* Check for index coverage */
} u;
};
@@ -3700,6 +3701,7 @@ int sqlite3ExprListCompare(ExprList*, ExprList*, int);
int sqlite3ExprImpliesExpr(Expr*, Expr*, int);
void sqlite3ExprAnalyzeAggregates(NameContext*, Expr*);
void sqlite3ExprAnalyzeAggList(NameContext*,ExprList*);
int sqlite3ExprCoveredByIndex(Expr*, int iCur, Index *pIdx);
int sqlite3FunctionUsesThisSrc(Expr*, SrcList*);
Vdbe *sqlite3GetVdbe(Parse*);
#ifndef SQLITE_OMIT_BUILTIN_TEST