diff options
Diffstat (limited to 'src/where.c')
| -rw-r--r-- | src/where.c | 28 |
1 files changed, 10 insertions, 18 deletions
diff --git a/src/where.c b/src/where.c index 4110431e4..eb51bdfac 100644 --- a/src/where.c +++ b/src/where.c @@ -12,7 +12,7 @@ ** This module contains C code that generates VDBE code used to process ** the WHERE clause of SQL statements. ** -** $Id: where.c,v 1.115 2004/09/25 13:12:16 drh Exp $ +** $Id: where.c,v 1.116 2004/10/04 13:38:09 drh Exp $ */ #include "sqliteInt.h" @@ -148,17 +148,8 @@ static int exprTableUsage(ExprMaskSet *pMaskSet, Expr *p){ ** "=", "<", ">", "<=", ">=", and "IN". */ static int allowedOp(int op){ - switch( op ){ - case TK_LT: - case TK_LE: - case TK_GT: - case TK_GE: - case TK_EQ: - case TK_IN: - return 1; - default: - return 0; - } + assert( TK_GT==TK_LE-1 && TK_LE==TK_LT-1 && TK_LT==TK_GE-1 && TK_EQ==TK_GT-1); + return op==TK_IN || (op>=TK_EQ && op<=TK_GE); } /* @@ -221,12 +212,13 @@ static void exprAnalyze(SrcList *pSrc, ExprMaskSet *pMaskSet, ExprInfo *pInfo){ assert( pExpr->op!=TK_IN ); SWAP(CollSeq*,pExpr->pRight->pColl,pExpr->pLeft->pColl); SWAP(Expr*,pExpr->pRight,pExpr->pLeft); - switch( pExpr->op ){ - case TK_LT: pExpr->op = TK_GT; break; - case TK_LE: pExpr->op = TK_GE; break; - case TK_GT: pExpr->op = TK_LT; break; - case TK_GE: pExpr->op = TK_LE; break; - default: break; + if( pExpr->op>=TK_GT ){ + assert( TK_LT==TK_GT+2 ); + assert( TK_GE==TK_LE+2 ); + assert( TK_GT>TK_EQ ); + assert( TK_GT<TK_LE ); + assert( pExpr->op>=TK_GT && pExpr->op<=TK_GE ); + pExpr->op = ((pExpr->op-TK_GT)^2)+TK_GT; } SWAP(unsigned, pInfo->prereqLeft, pInfo->prereqRight); SWAP(short int, pInfo->idxLeft, pInfo->idxRight); |