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

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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
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25
src/expr.c
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@@ -3543,6 +3543,14 @@ int sqlite3ExprCodeTarget(Parse *pParse, Expr *pExpr, int target){
codeInteger(pParse, pExpr, 0, target);
return target;
}
case TK_TRUE: {
sqlite3VdbeAddOp2(v, OP_Integer, 1, target);
return target;
}
case TK_FALSE: {
sqlite3VdbeAddOp2(v, OP_Integer, 0, target);
return target;
}
#ifndef SQLITE_OMIT_FLOATING_POINT
case TK_FLOAT: {
assert( !ExprHasProperty(pExpr, EP_IntValue) );
@@ -3698,6 +3706,13 @@ int sqlite3ExprCodeTarget(Parse *pParse, Expr *pExpr, int target){
sqlite3VdbeAddOp2(v, op, r1, inReg);
break;
}
case TK_ISTRUE: {
r1 = sqlite3ExprCodeTemp(pParse, pExpr->pLeft, &regFree1);
testcase( regFree1==0 );
sqlite3VdbeAddOp2(v, OP_Not, r1, inReg);
sqlite3VdbeAddOp2(v, OP_Not, inReg, inReg);
break;
}
case TK_ISNULL:
case TK_NOTNULL: {
int addr;
@@ -4473,6 +4488,11 @@ void sqlite3ExprIfTrue(Parse *pParse, Expr *pExpr, int dest, int jumpIfNull){
sqlite3ExprIfFalse(pParse, pExpr->pLeft, dest, jumpIfNull);
break;
}
case TK_ISTRUE: {
testcase( jumpIfNull==0 );
sqlite3ExprIfTrue(pParse, pExpr->pLeft, dest, jumpIfNull);
break;
}
case TK_IS:
case TK_ISNOT:
testcase( op==TK_IS );
@@ -4627,6 +4647,11 @@ void sqlite3ExprIfFalse(Parse *pParse, Expr *pExpr, int dest, int jumpIfNull){
sqlite3ExprIfTrue(pParse, pExpr->pLeft, dest, jumpIfNull);
break;
}
case TK_ISTRUE: {
testcase( jumpIfNull==0 );
sqlite3ExprIfFalse(pParse, pExpr->pLeft, dest, jumpIfNull);
break;
}
case TK_IS:
case TK_ISNOT:
testcase( pExpr->op==TK_IS );