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In partial index scans, if the WHERE clause implies a constant value for a table column, replace occurences of that table column with the constant. This increases the likelihood of the partial index being a covering index.

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FossilOrigin-Name: 66ed7abdfa228abde2052e3988589371f0e49b11582b1b4a83255d2df3a0aefa
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dan
2023-09-22 20:21:27 +00:00
parent 8aaf63c6ac
commit bd42642431
7 changed files with 295 additions and 18 deletions
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src/sqliteInt.h
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@@ -3790,6 +3790,7 @@ struct Parse {
int *aLabel; /* Space to hold the labels */
ExprList *pConstExpr;/* Constant expressions */
IndexedExpr *pIdxEpr;/* List of expressions used by active indexes */
IndexedExpr *pIdxPartExpr; /* Exprs constrained by index WHERE clauses */
Token constraintName;/* Name of the constraint currently being parsed */
yDbMask writeMask; /* Start a write transaction on these databases */
yDbMask cookieMask; /* Bitmask of schema verified databases */
@@ -4939,6 +4940,7 @@ int sqlite3WhereOkOnePass(WhereInfo*, int*);
#define ONEPASS_SINGLE 1 /* ONEPASS valid for a single row update */
#define ONEPASS_MULTI 2 /* ONEPASS is valid for multiple rows */
int sqlite3WhereUsesDeferredSeek(WhereInfo*);
void sqlite3WherePartIdxExpr(Parse*, Index*, Expr*, int, SrcItem*);
void sqlite3ExprCodeLoadIndexColumn(Parse*, Index*, int, int, int);
int sqlite3ExprCodeGetColumn(Parse*, Table*, int, int, int, u8);
void sqlite3ExprCodeGetColumnOfTable(Vdbe*, Table*, int, int, int);