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Overview
Comment:Small performance optimization in the expression walker.
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SHA1:c6e6afb9391704d9119335f2ce17df3968acb514
User & Date: drh 2016-09-19 02:19:00
Context
2016-09-19
10:24
Improved performance in sqlite3ExprCodeTarget(). check-in: 75146165 user: drh tags: trunk
02:19
Small performance optimization in the expression walker. check-in: c6e6afb9 user: drh tags: trunk
2016-09-18
16:08
Revise the implementation of OP_Once so that it is smaller, faster, and uses less memory. This also fixes an obscure bug introduced 3 days ago by check-in [5990a1bdb4a073]. check-in: 6bf5ba10 user: drh tags: trunk
Changes
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Changes to src/walker.c.

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  testcase( ExprHasProperty(pExpr, EP_Reduced) );
  rc = pWalker->xExprCallback(pWalker, pExpr);
  if( rc || ExprHasProperty(pExpr,EP_TokenOnly) ) return rc & WRC_Abort;
  if( pExpr->pLeft && walkExpr(pWalker, pExpr->pLeft) ) return WRC_Abort;
  if( pExpr->pRight && walkExpr(pWalker, pExpr->pRight) ) return WRC_Abort;
  if( ExprHasProperty(pExpr, EP_xIsSelect) ){
    if( sqlite3WalkSelect(pWalker, pExpr->x.pSelect) ) return WRC_Abort;
  }else{
    if( sqlite3WalkExprList(pWalker, pExpr->x.pList) ) return WRC_Abort;
  }
  return WRC_Continue;
}
int sqlite3WalkExpr(Walker *pWalker, Expr *pExpr){
  return pExpr ? walkExpr(pWalker,pExpr) : WRC_Continue;
}







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  testcase( ExprHasProperty(pExpr, EP_Reduced) );
  rc = pWalker->xExprCallback(pWalker, pExpr);
  if( rc || ExprHasProperty(pExpr,EP_TokenOnly) ) return rc & WRC_Abort;
  if( pExpr->pLeft && walkExpr(pWalker, pExpr->pLeft) ) return WRC_Abort;
  if( pExpr->pRight && walkExpr(pWalker, pExpr->pRight) ) return WRC_Abort;
  if( ExprHasProperty(pExpr, EP_xIsSelect) ){
    if( sqlite3WalkSelect(pWalker, pExpr->x.pSelect) ) return WRC_Abort;
  }else if( pExpr->x.pList ){
    if( sqlite3WalkExprList(pWalker, pExpr->x.pList) ) return WRC_Abort;
  }
  return WRC_Continue;
}
int sqlite3WalkExpr(Walker *pWalker, Expr *pExpr){
  return pExpr ? walkExpr(pWalker,pExpr) : WRC_Continue;
}