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Add optimizations for the IN operator in WHERE clauses. This is a partial

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implementation of enhancement #63.  Still need to add test cases. (CVS 610)

FossilOrigin-Name: 8481e841ebdeabe07bf780246bda1aa053eb60b7
This commit is contained in:
drh
2002-06-08 23:25:08 +00:00
parent f5db2d3ea2
commit d99f70680f
7 changed files with 187 additions and 110 deletions
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9
src/sqliteInt.h
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@@ -11,7 +11,7 @@
*************************************************************************
** Internal interface definitions for SQLite.
**
** @(#) $Id: sqliteInt.h,v 1.120 2002/06/06 18:54:41 drh Exp $
** @(#) $Id: sqliteInt.h,v 1.121 2002/06/08 23:25:09 drh Exp $
*/
#include "sqlite.h"
#include "hash.h"
@@ -411,7 +411,8 @@ struct Token {
struct Expr {
int op; /* Operation performed by this node */
Expr *pLeft, *pRight; /* Left and right subnodes */
ExprList *pList; /* A list of expressions used as a function argument */
ExprList *pList; /* A list of expressions used as function arguments
** or in "<expr> IN (<expr-list)" */
Token token; /* An operand token */
Token span; /* Complete text of the expression */
int iTable, iColumn; /* When op==TK_COLUMN, then this expr node means the
@@ -419,7 +420,8 @@ struct Expr {
** op==TK_FUNCTION, iColumn holds the function id */
int iAgg; /* When op==TK_COLUMN and pParse->useAgg==TRUE, pull
** result from the iAgg-th element of the aggregator */
Select *pSelect; /* When the expression is a sub-select */
Select *pSelect; /* When the expression is a sub-select. Also the
** right side of "<expr> IN (<select>)" */
};
/*
@@ -508,6 +510,7 @@ struct WhereLevel {
int op, p1, p2; /* Opcode used to terminate the loop */
int iLeftJoin; /* Memory cell used to implement LEFT OUTER JOIN */
int top; /* First instruction of interior of the loop */
int inOp, inP1, inP2;/* Opcode used to implement an IN operator */
};
/*