Hi All,   I have created an external table from an existing parquet file:   +---------+------------------+-----------------------------+ | name    | type             | comment                     | +---------+------------------+-----------------------------+ | name    | string           | Inferred from Parquet file. | | address | struct<          | Inferred from Parquet file. | |         |   street:string, |                             | |         |   city:string    |                             | |         | >                |                             | +---------+------------------+-----------------------------+   Then I was trying to learn how schema evolution works and I created a new parquet file with a slightly different schema. New file now has an extra field in address called 'house_no'. Now if I executed a query involving address field, I woud get an error:   Query: select address.house_no, address.street, address.city from existing_parquet ERROR: AnalysisException: Could not resolve column/field reference: 'address.house_no'   Then I was trying to alter the table to accomadate the new field in address, but I coudn't figure out a way to do that. For instance, if I executed something like:   ALTER TABLE existing_parquet ADD COLUMNS (address.house_no INTEGER);   I'd get a syntax error:   ERROR: AnalysisException: Syntax error in line 1: ...rquet ADD COLUMNS (address.house_no INTEGER)                              ^ Encountered: . Expected: ARRAY, BIGINT, BINARY, BOOLEAN, CHAR, DATE, DATETIME, DECIMAL, REAL, FLOAT, INTEGER, MAP, SMALLINT, STRING, STRUCT, TIMESTAMP, TINYINT, VARCHAR   CAUSED BY: Exception: Syntax error   So my question is is it possible to add a field to a complex type? If so how do I refer to the nested columns?   Thanks Lloyd   ... View more