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Avoid storing redundant fields in sorter records when the sort-key and data have

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fields in common (as in "SELECT a FROM t1 ORDER BY 1").

FossilOrigin-Name: 0af62fdbd8e2aab14718ff8bcb5934f05463c176
This commit is contained in:
dan
2016-11-10 20:14:06 +00:00
parent 58282f68d8
commit 257c13fa00
5 changed files with 54 additions and 21 deletions
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9
src/expr.c
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@@ -4086,8 +4086,13 @@ int sqlite3ExprCodeExprList(
if( !ConstFactorOk(pParse) ) flags &= ~SQLITE_ECEL_FACTOR;
for(pItem=pList->a, i=0; i<n; i++, pItem++){
Expr *pExpr = pItem->pExpr;
if( (flags & SQLITE_ECEL_REF)!=0 && (j = pList->a[i].u.x.iOrderByCol)>0 ){
sqlite3VdbeAddOp2(v, copyOp, j+srcReg-1, target+i);
if( (flags & SQLITE_ECEL_REF)!=0 && (j = pItem->u.x.iOrderByCol)>0 ){
if( flags & SQLITE_ECEL_OMITREF ){
i--;
n--;
}else{
sqlite3VdbeAddOp2(v, copyOp, j+srcReg-1, target+i);
}
}else if( (flags & SQLITE_ECEL_FACTOR)!=0 && sqlite3ExprIsConstant(pExpr) ){
sqlite3ExprCodeAtInit(pParse, pExpr, target+i, 0);
}else{