DESCRIBE FILE FORMAT¶

Describes the property type (for example, String or Integer), the defined value of the property, and the default value for each property in a file format object definition. For more information about available properties for each file type, see “Format type options” in CREATE FILE FORMAT.

DESCRIBE can be abbreviated to DESC.

See also:: DROP FILE FORMAT , ALTER FILE FORMAT , CREATE FILE FORMAT , SHOW FILE FORMATS

Syntax¶

DESC[RIBE] FILE FORMAT <name>

Copy

Parameters¶

name: Specifies the identifier for the file format to describe. If the identifier contains spaces or special characters, the entire string must be enclosed in double quotes. Identifiers enclosed in double quotes are also case-sensitive.

Usage notes¶

To post-process the output of this command, you can use the RESULT_SCAN function, which treats the output as a table that can be queried.

Examples¶

Describe the file format object named my_csv_format:

DESC FILE FORMAT my_csv_format;

Copy

Output:

+--------------------------------+---------------+----------------+------------------+
| property                       | property_type | property_value | property_default |
+--------------------------------+---------------+----------------+------------------+
| TYPE                           | String        | csv            | CSV              |
| RECORD_DELIMITER               | String        | \n             | \n               |
| FIELD_DELIMITER                | String        | ,              | ,                |
| FILE_EXTENSION                 | String        |                |                  |
| SKIP_HEADER                    | Integer       | 0              | 0                |
| PARSE_HEADER                   | Boolean       | FALSE          | FALSE            |
| DATE_FORMAT                    | String        | AUTO           | AUTO             |
| TIME_FORMAT                    | String        | AUTO           | AUTO             |
| TIMESTAMP_FORMAT               | String        | AUTO           | AUTO             |
| BINARY_FORMAT                  | String        | HEX            | HEX              |
| ESCAPE                         | String        | NONE           | NONE             |
| ESCAPE_UNENCLOSED_FIELD        | String        | \\             | \\               |
| TRIM_SPACE                     | Boolean       | FALSE          | FALSE            |
| FIELD_OPTIONALLY_ENCLOSED_BY   | String        | NONE           | NONE             |
| NULL_IF                        | List          | [\\N]          | [\\N]            |
| COMPRESSION                    | String        | AUTO           | AUTO             |
| ERROR_ON_COLUMN_COUNT_MISMATCH | Boolean       | TRUE           | TRUE             |
| VALIDATE_UTF8                  | Boolean       | TRUE           | TRUE             |
| SKIP_BLANK_LINES               | Boolean       | FALSE          | FALSE            |
| REPLACE_INVALID_CHARACTERS     | Boolean       | FALSE          | FALSE            |
| EMPTY_FIELD_AS_NULL            | Boolean       | TRUE           | TRUE             |
| SKIP_BYTE_ORDER_MARK           | Boolean       | TRUE           | TRUE             |
| ENCODING                       | String        | UTF8           | UTF8             |
+--------------------------------+---------------+----------------+------------------+

Describe the file format object named my_json_format:

DESC FILE FORMAT `my_json_format`;

Copy

Output:

+----------------------------+---------------+----------------+------------------+
| property                   | property_type | property_value | property_default |
+----------------------------+---------------+----------------+------------------+
| TYPE                       | String        | JSON           | CSV              |
| FILE_EXTENSION             | String        |                |                  |
| DATE_FORMAT                | String        | AUTO           | AUTO             |
| TIME_FORMAT                | String        | AUTO           | AUTO             |
| TIMESTAMP_FORMAT           | String        | AUTO           | AUTO             |
| BINARY_FORMAT              | String        | HEX            | HEX              |
| TRIM_SPACE                 | Boolean       | FALSE          | FALSE            |
| NULL_IF                    | List          | []             | [\\N]            |
| COMPRESSION                | String        | AUTO           | AUTO             |
| ENABLE_OCTAL               | Boolean       | FALSE          | FALSE            |
| ALLOW_DUPLICATE            | Boolean       | FALSE          | FALSE            |
| STRIP_OUTER_ARRAY          | Boolean       | FALSE          | FALSE            |
| STRIP_NULL_VALUES          | Boolean       | FALSE          | FALSE            |
| IGNORE_UTF8_ERRORS         | Boolean       | FALSE          | FALSE            |
| REPLACE_INVALID_CHARACTERS | Boolean       | FALSE          | FALSE            |
| SKIP_BYTE_ORDER_MARK       | Boolean       | TRUE           | TRUE             |
+----------------------------+---------------+----------------+------------------+

Describe the file format object named my_parquet_format:

DESC FILE FORMAT `my_parquet_format`;

Copy

Output:

+----------------+---------------+----------------+------------------+
| property       | property_type | property_value | property_default |
+----------------+---------------+----------------+------------------+
| TYPE           | String        | PARQUET        | CSV              |
| TRIM_SPACE     | Boolean       | FALSE          | FALSE            |
| NULL_IF        | List          | []             | [\\N]            |
| COMPRESSION    | String        | SNAPPY         | AUTO             |
| BINARY_AS_TEXT | Boolean       | TRUE           | TRUE             |
+----------------+---------------+----------------+------------------+