database/sqlite
1
0
Fork 0
mirror of https://github.com/sqlite/sqlite.git synced 2025-11-12 13:01:09 +03:00
Code Activity

Experimental implementation of IS TRUE and IS FALSE operators. All TRUE and

Browse Source 
FALSE to act like constants if the names do not resolve to a column name.

FossilOrigin-Name: 40314bc999af08ab10e654241208842b4bb95b19858d11249444372250ea4160
This commit is contained in:
drh
2018-02-26 03:20:18 +00:00
parent 5facffbc70
commit 007c843b0f
6 changed files with 76 additions and 19 deletions
Download Patch File Download Diff File Expand all files Collapse all files

36
src/resolve.c
View File

@@ -431,10 +431,22 @@ static int lookupName(
** Because no reference was made to outer contexts, the pNC->nRef
** fields are not changed in any context.
*/
if( cnt==0 && zTab==0 && ExprHasProperty(pExpr,EP_DblQuoted) ){
pExpr->op = TK_STRING;
pExpr->pTab = 0;
return WRC_Prune;
if( cnt==0 && zTab==0 ){
if( ExprHasProperty(pExpr,EP_DblQuoted) ){
pExpr->op = TK_STRING;
pExpr->pTab = 0;
return WRC_Prune;
}
if( sqlite3StrICmp(zCol, "true")==0 ){
pExpr->op = TK_TRUE;
pExpr->pTab = 0;
return WRC_Prune;
}
if( sqlite3StrICmp(zCol, "false")==0 ){
pExpr->op = TK_FALSE;
pExpr->pTab = 0;
return WRC_Prune;
}
}
/*
@@ -783,6 +795,21 @@ static int resolveExprStep(Walker *pWalker, Expr *pExpr){
notValid(pParse, pNC, "parameters", NC_IsCheck|NC_PartIdx|NC_IdxExpr);
break;
}
case TK_IS:
/* Handle special cases of "x IS TRUE" and "x IS FALSE". The first
** is transformed into "+x" and the second into "NOT x". */
if( pExpr->pRight->op==TK_ID ){
int rc = resolveExprStep(pWalker, pExpr->pRight);
if( rc==WRC_Abort ) return WRC_Abort;
if( pExpr->pRight->op==TK_TRUE ){
pExpr->op = TK_ISTRUE;
return WRC_Continue;
}else if( pExpr->pRight->op==TK_FALSE ){
pExpr->op = TK_NOT;
return WRC_Continue;
}
}
/* Fall thru */
case TK_BETWEEN:
case TK_EQ:
case TK_NE:
@@ -790,7 +817,6 @@ static int resolveExprStep(Walker *pWalker, Expr *pExpr){
case TK_LE:
case TK_GT:
case TK_GE:
case TK_IS:
case TK_ISNOT: {
int nLeft, nRight;
if( pParse->db->mallocFailed ) break;