SelectWithUnionQuery (children 2)
 ExpressionList (children 1)
  SelectQuery (children 3)
   ExpressionList (children 1)
    Literal UInt64_1
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier bftest
   Function or (children 1)
    ExpressionList (children 2)
     Function has (children 1)
      ExpressionList (children 2)
       Identifier x
       Literal Float64_-0
     Literal Float64_0
 Identifier Null
