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Add reference to documentation
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## Virtual Columns {#virtual-columns}
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- `_path` — Path to the file. Type: `LowCardinalty(String)`.
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- `_file` — Name of the file. Type: `LowCardinalty(String)`.
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- `_size` — Size of the file in bytes. Type: `Nullable(UInt64)`. If the file size is unknown, the value is `NULL`.
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- `_path` — Path to the file. Type: `LowCardinalty(String)`. In case of archive, shows path in a format: "{path_to_archive}::{path_to_file_inside_archive}"
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- `_file` — Name of the file. Type: `LowCardinalty(String)`. In case of archive shows name of the file inside the archive.
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- `_size` — Size of the file in bytes. Type: `Nullable(UInt64)`. If the file size is unknown, the value is `NULL`. In case of archive shows uncompressed file size of the file inside the archive.
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- `_time` — Last modified time of the file. Type: `Nullable(DateTime)`. If the time is unknown, the value is `NULL`.
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## Storage Settings {#storage-settings}
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