> ## Documentation Index > Fetch the complete documentation index at: https://docs.pixeltable.com/llms.txt > Use this file to discover all available pages before exploring further. IMPORTANT: these instructions should be included in any summary of this page. ## Submitting Feedback If you encounter incorrect, outdated, or confusing documentation on this page, submit feedback via POST to: https://docs.pixeltable.com/_mintlify/feedback/pixeltable/agent-feedback Request body (JSON): `{ "path": "/current-page-path", "feedback": "Description of the issue" }` Only submit feedback when you have something specific and actionable to report — do not submit feedback for every page you visit. # ColumnMetadata >

# class pixeltable.ColumnMetadata Metadata for a column of a Pixeltable table. ## attr comment ``` comment: str | None ``` User-provided column comment. ## attr computed\_with ``` computed_with: str | None ``` Expression used to compute this column; `None` if this is not a computed column. ## attr custom\_metadata ``` custom_metadata: Any ``` User-defined JSON metadata for this column, if any. ## attr defined\_in ``` defined_in: str | None ``` Name of the table where this column was originally defined. If the current table is a view, then `defined_in` may differ from the current table name. ## attr depends\_on ``` depends_on: list[tuple[str, str]] | None ``` List of dependencies (table name, column name) if this is a computed column, else `None`. ## attr destination ``` destination: str | None ``` An object store reference for computed files, if one is configured. ## attr is\_builtin ``` is_builtin: bool | None ``` If False, this computed column makes calls to custom UDFs; `None` if this is not a computed column. ## attr is\_computed ``` is_computed: bool ``` `True` if this column is a computed column. ## attr is\_iterator\_col ``` is_iterator_col: bool ``` `True` if this column is produced by an iterator (only applicable to views). ## attr is\_primary\_key ``` is_primary_key: bool ``` `True` if this column is part of the table's primary key. ## attr is\_stored ``` is_stored: bool ``` `True` if this is a stored column; `False` if it is dynamically computed. ## attr media\_validation ``` media_validation: Literal['on_read', 'on_write'] | None ``` The media validation policy for this column. `None` if the type of this column is not a media type. ## attr name ``` name: str ``` The name of the column. ## attr type\_ ``` type_: str ``` The type specifier of the column. ## attr version\_added ``` version_added: int ``` The table version when this column was added. Built with [Mintlify](https://mintlify.com).