docs: add compression_type option for CSV/JSON import/export

[Copilot]

What's Changed in this PR

Documents the new compression_type option for COPY TO and COPY FROM commands introduced in GreptimeTeam/greptimedb#7162.

Updated sections:

• Added compression_type parameter to COPY TO WITH options table
• Added compression_type parameter to COPY FROM WITH options table
• Added compression_type parameter to COPY query results WITH options table
• Added examples demonstrating gzip compression for table exports, imports, and query results
• Added NOTE sections reminding users to use appropriate file extensions for each compression type
• Polished all documentation text to read naturally in both English and Chinese while maintaining technical accuracy

Example usage:

-- Export table to compressed CSV
COPY tbl TO '/path/to/file.csv.gz' WITH (
  FORMAT = 'csv',
  compression_type = 'gzip'
);

-- Import table from compressed CSV
COPY tbl FROM '/path/to/file.csv.gz' WITH (
  FORMAT = 'csv',
  compression_type = 'gzip'
);

-- Export query results to compressed JSON
COPY (SELECT * FROM tbl WHERE host = 'host1') TO '/path/to/file.json.gz' WITH (
  FORMAT = 'json',
  compression_type = 'gzip'
);

Supported compression types:

• gzip - Gzip compression (.gz extension)
• zstd - Zstandard compression (.zst extension)
• bzip2 - Bzip2 compression (.bz2 extension)
• xz - XZ compression (.xz extension)

Important notes:

• Only available for CSV and JSON formats
• File extensions must match the compression type: .gz for gzip, .zst for zstd, .bz2 for bzip2, and .xz for xz

Checklist

• Please confirm that all corresponding versions of the documents have been revised.

• Please ensure that the content in sidebars.ts matches the current document structure when you changed the document structure.

• This change requires follow-up update in localized docs.

• Fixes Update docs for feat: implement compressed CSV/JSON export functionality #2213

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Update docs for feat: implement compressed CSV/JSON export functionality</issue_title>
<issue_description>A document change request is generated from GreptimeTeam/greptimedb#7162</issue_description>

<agent_instructions>update nightly docs and Chinese version</agent_instructions>

Comments on the Issue (you are @copilot in this section)

• Fixes Update docs for feat: implement compressed CSV/JSON export functionality #2213

---

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View logs

[WenyXu]

@copilot it supports following compression type

COPY test_csv_export TO '${SQLNESS_HOME}/import/test_csv_gzip.csv.gz' WITH (format='csv', compression_type='gzip');
COPY test_csv_export TO '${SQLNESS_HOME}/import/test_csv_zstd.csv.zst' WITH (format='csv', compression_type='zstd');
COPY test_csv_export TO '${SQLNESS_HOME}/import/test_csv_bzip2.csv.bz2' WITH (format='csv', compression_type='bzip2');
COPY test_csv_export TO '${SQLNESS_HOME}/import/test_csv_xz.csv.xz' WITH (format='csv', compression_type='xz');

[Copilot]

@copilot it supports following compression type

COPY test_csv_export TO '${SQLNESS_HOME}/import/test_csv_gzip.csv.gz' WITH (format='csv', compression_type='gzip');

...

Updated the documentation to include all supported compression types (gzip, zstd, bzip2, xz) and corrected the parameter name to compression_type. Changes made in commit a744743.

[WenyXu]

@copilot Copy From also supports this feature, please take a look at the PR test context for reference.

COPY test_json_import_gzip FROM '${SQLNESS_HOME}/import/test_json_gzip.json.gz' WITH (format='json', compression_type='gzip');

[Copilot]

@copilot Copy From also supports this feature, please take a look at the PR test context for reference.

...

Added compression_type support to the COPY FROM documentation with example showing how to import from compressed files. Changes made in commit 79518e6.

[WenyXu]

@copilot Polish all text while respecting its original style and tone. Ensure English reads like native English, and Chinese reads like native Chinese. Keep technical content, formatting, and structur...

[Copilot]

@copilot Polish all text while respecting its original style and tone. Ensure English reads like native English, and Chinese reads like native Chinese. Keep technical content, formatting, and structu...

Polished all text to read more naturally in both English and Chinese while maintaining the technical content and formatting. Changes made in commit 87fea8d.