SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 3)
   ExpressionList (children 1)
    Identifier x
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier test
   Function or (children 1)
    ExpressionList (children 2)
     Function notEquals (children 1)
      ExpressionList (children 2)
       Identifier x
       Literal UInt64_0
     Function isNull (children 1)
      ExpressionList (children 1)
       Identifier x