substExpr
substExpr(pExpr->pLeft, iTable, pEList);
substExpr(pExpr->pRight, iTable, pEList);
substExpr(pList->a[i].pExpr, iTable, pEList);
substExpr(p->pHaving, iParent, pSub->pEList);
substExpr(p->pHaving, iParent, pSub->pEList);
substExpr(p->pWhere, iParent, pSub->pEList);