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 materialize (children 1)
      ExpressionList (children 1)
       Literal Array_[UInt64_1, UInt64_2, UInt64_3]
 Identifier Null
