SelectWithUnionQuery (children 2)
 ExpressionList (children 1)
  SelectQuery (children 3)
   ExpressionList (children 1)
    Function count (children 1)
     ExpressionList
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier bftest
   Function hasAny (children 1)
    ExpressionList (children 2)
     Identifier x
     Function array (children 1)
      ExpressionList (children 3)
       Literal UInt64_1
       Literal UInt64_2
       Identifier k
 Identifier Null
