SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 4)
    Function tupleElement (alias fine_k1_with_0) (children 1)
     ExpressionList (children 3)
      Identifier tuple
      Literal \'k1\'
      Literal UInt64_0
    Function tupleElement (alias k1_with_null) (children 1)
     ExpressionList (children 3)
      Identifier tuple
      Literal \'k1\'
      Literal NULL
    Function tupleElement (alias k2_with_0) (children 1)
     ExpressionList (children 3)
      Identifier tuple
      Literal \'k2\'
      Literal UInt64_0
    Function tupleElement (alias k2_with_null) (children 1)
     ExpressionList (children 3)
      Identifier tuple
      Literal \'k2\'
      Literal NULL
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier test_tuple_element
