905   Expr *pRoot,  in sqlite3ExprAttachSubtrees()  argument
909   if( pRoot==0 ){  in sqlite3ExprAttachSubtrees()
914     assert( ExprUseXList(pRoot) );  in sqlite3ExprAttachSubtrees()
915     assert( pRoot->x.pSelect==0 );  in sqlite3ExprAttachSubtrees()
917       pRoot->pRight = pRight;  in sqlite3ExprAttachSubtrees()
918       pRoot->flags |= EP_Propagate & pRight->flags;  in sqlite3ExprAttachSubtrees()
920       pRoot->nHeight = pRight->nHeight+1;  in sqlite3ExprAttachSubtrees()
922       pRoot->nHeight = 1;  in sqlite3ExprAttachSubtrees()
926       pRoot->pLeft = pLeft;  in sqlite3ExprAttachSubtrees()
927       pRoot->flags |= EP_Propagate & pLeft->flags;  in sqlite3ExprAttachSubtrees()
929       if( pLeft->nHeight>=pRoot->nHeight ){  in sqlite3ExprAttachSubtrees()
930         pRoot->nHeight = pLeft->nHeight+1;  in sqlite3ExprAttachSubtrees()