sqliteExprIsConstant
if( p->pLeft && !sqliteExprIsConstant(p->pLeft) ) return 0;
if( p->pRight && !sqliteExprIsConstant(p->pRight) ) return 0;
if( !sqliteExprIsConstant(p->pList->a[i].pExpr) ) return 0;
if( !sqliteExprIsConstant(pE2) ){
if( sqliteExprIsConstant(pE) ){
if( sqliteExprIsConstant(pE) ){
int sqliteExprIsConstant(Expr*);
if( pWhere && (pTabList->nSrc==0 || sqliteExprIsConstant(pWhere)) ){