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Use NOT NULL partial indexes when the query is constrained by a single

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LIKE or GLOB.

FossilOrigin-Name: 9b3a3b41b59a7ce7d3dd82c7402d6fdc6a5ca43c
This commit is contained in:
drh
2016-11-02 02:17:52 +00:00
parent d7265378fd
commit 1ad93a003d
3 changed files with 12 additions and 14 deletions
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15
manifest
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@@ -1,5 +1,5 @@
C Add\sthe\sSQLITE_DBCONFIG_NO_CKPT_ON_CLOSE\ssqlite3_dbconfig()\soption\s-\sfor\ndisabling\sSQLite's\sdefault\scheckpoint-on-close\sbehaviour.
D 2016-10-31T16:49:18.127
C Use\sNOT\sNULL\spartial\sindexes\swhen\sthe\squery\sis\sconstrained\sby\sa\ssingle\nLIKE\sor\sGLOB.
D 2016-11-02T02:17:52.919
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F src/date.c 95c9a8d00767e7221a8e9a31f4e913fc8029bf6b
F src/dbstat.c 19ee7a4e89979d4df8e44cfac7a8f905ec89b77d
F src/delete.c cb3f6300df24c26c609778b2731f82644b5532ec
F src/expr.c aac0b8d39373ce8f1d47829ce12c3d7af90c46a6
F src/expr.c ce7110980fac6dfdfbe1e393443bdb79bad29339
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2
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@@ -1 +1 @@
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9b3a3b41b59a7ce7d3dd82c7402d6fdc6a5ca43c

9
src/expr.c
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@@ -4600,11 +4600,10 @@ int sqlite3ExprImpliesExpr(Expr *pE1, Expr *pE2, int iTab){
){
return 1;
}
if( pE2->op==TK_NOTNULL
&& sqlite3ExprCompare(pE1->pLeft, pE2->pLeft, iTab)==0
&& (pE1->op!=TK_ISNULL && pE1->op!=TK_IS)
){
return 1;
if( pE2->op==TK_NOTNULL && pE1->op!=TK_ISNULL && pE1->op!=TK_IS ){
Expr *pX = sqlite3ExprSkipCollate(pE1->pLeft);
testcase( pX!=pE1->pLeft );
if( sqlite3ExprCompare(pX, pE2->pLeft, iTab)==0 ) return 1;
}
return 0;
}