InsertQuery   (children 2)
 Identifier test_length_map
 SelectWithUnionQuery (children 1)
  ExpressionList (children 1)
   SelectQuery (children 1)
    ExpressionList (children 3)
     Literal UInt64_42
     Literal UInt64_100
     Function map (children 1)
      ExpressionList (children 4)
       Literal \'a\'
       Literal UInt64_1
       Literal \'b\'
       Literal UInt64_2
