sqliteExprCompare
if( !sqliteExprCompare(pA->pLeft, pB->pLeft) ) return 0;
if( !sqliteExprCompare(pA->pRight, pB->pRight) ) return 0;
if( !sqliteExprCompare(pA->pList->a[i].pExpr, pB->pList->a[i].pExpr) ){
if( sqliteExprCompare(aAgg[i].pExpr, pExpr) ){
if( iCol<0 && sqliteExprCompare(pE, pEList->a[j].pExpr) ){
int sqliteExprCompare(Expr*, Expr*);