SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 1)
    Function sum (children 1)
     ExpressionList (children 1)
      Identifier a
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      Subquery (children 1)
       SelectWithUnionQuery (children 1)
        ExpressionList (children 1)
         SelectQuery (children 3)
          ExpressionList (children 2)
           Identifier B
           Function uniqExact (alias a) (children 1)
            ExpressionList (children 1)
             Identifier A
          TablesInSelectQuery (children 1)
           TablesInSelectQueryElement (children 1)
            TableExpression (children 1)
             Function remote (children 1)
              ExpressionList (children 3)
               Literal \'localhost,127.0.0.1\'
               Function currentDatabase (children 1)
                ExpressionList
               Identifier da_memory_efficient_shard
          ExpressionList (children 1)
           Identifier B
