v3.30.1

What's Changed

• Move _normalize_hive_syntax to DefaultTypeConverter and fix pass stubs by @laughingman7743 in #695
• Always use C engine for CSV parsing and simplify engine selection logic by @laughingman7743 in #697

Bug Fixes

• Fix CSV parsing performance regression — PR #594 incorrectly forced the Python CSV engine for files over 50MB based on fabricated claims about pandas C parser int32 limitations. The C engine is now always used as the default (same as pandas' own default), restoring up to 28% faster CSV parsing. See #696 for details.

Internal

• Refactored type converter: moved _normalize_hive_syntax to DefaultTypeConverter and cleaned up pass stubs.
• Simplified CSV engine selection from 4 methods to 2 by removing dead code and inlining pyarrow compatibility checks.

Affected Versions

All versions from v3.17.0 through v3.30.0 (released 2025-08-09 to 2026-02-28) are affected by this performance regression. The last unaffected version is v3.16.0.

Workaround for older versions

If you cannot upgrade to v3.30.1, explicitly specify the C engine to bypass the incorrect engine selection:

cursor = connection.cursor(PandasCursor, engine="c")

Full Changelog: v3.30.0...v3.30.1

v3.30.0

What's Changed

• Add documentation for AioS3FileSystem and S3Executor by @laughingman7743 in #686
• Expand ruff lint rules and rename make targets (chk→lint, fmt→format) by @laughingman7743 in #687
• Add AioSQLAlchemy extra package to documentation by @laughingman7743 in #688
• Add result_set_type_hints for precise complex type conversion by @laughingman7743 in #690

Full Changelog: v3.29.3...v3.30.0

v3.29.3

What's Changed

• Add S3Executor strategy pattern for async S3 operations by @laughingman7743 in #684

Full Changelog: v3.29.2...v3.29.3

v3.29.2

What's Changed

• Fix release workflow and split CI test jobs for independent retries by @laughingman7743 in #682
• Rename aconnect to aio_connect by @laughingman7743 in #683

Full Changelog: v3.29.1...v3.29.2

v3.29.1

What's Changed

• Add async SQLAlchemy dialects for native asyncio support by @laughingman7743 in #679
• Fix mypy errors with SQLAlchemy 2.0.46+ by @laughingman7743 in #681

Full Changelog: v3.29.0...v3.29.1

v3.29.0

What's Changed

• Add native asyncio cursor support (Phase 1) by @laughingman7743 in #666
• Add native asyncio specialized cursors and DRY refactors (Phase 2) by @laughingman7743 in #667
• Add native asyncio S3FS and Spark cursors with boilerplate deduplication (Phase 3) by @laughingman7743 in #668
• Add documentation for native asyncio cursors by @laughingman7743 in #671
• Wrap fetch methods in asyncio.to_thread for aio pandas/arrow/polars cursors by @laughingman7743 in #674
• Extract shared boilerplate from sync cursors into WithFetch mixin by @laughingman7743 in #676
• Extract _prepare_unload() helper into BaseCursor by @laughingman7743 in #678

Full Changelog: v3.28.0...v3.29.0

v3.28.0

What's Changed

• Update documentation domain to pyathena.dev by @laughingman7743 in #663
• Support Athena managed query result storage by @laughingman7743 in #665

Full Changelog: v3.27.2...v3.28.0

v3.27.2

What's Changed

• Rewrite CLAUDE.md for maintainability by @laughingman7743 in #660
• Update repository URLs from laughingman7743 to pyathena-dev by @laughingman7743 in #661

Full Changelog: v3.27.1...v3.27.2

v3.27.1

What's Changed

• Fix README logo not displaying on PyPI by @laughingman7743 in #659

Full Changelog: v3.27.0...v3.27.1

v3.27.0

What's Changed

• Fix retry_api_call to use getEffectiveLevel() instead of logger.level by @laughingman7743 in #651
• Add project logo to README and documentation by @laughingman7743 in #650
• Bump urllib3 from 1.26.20 to 2.6.3 by @dependabot[bot] in #656
• Bump requests from 2.32.3 to 2.32.4 by @dependabot[bot] in #655
• Bump setuptools from 75.6.0 to 78.1.1 by @dependabot[bot] in #653
• Bump jinja2 from 3.1.5 to 3.1.6 by @dependabot[bot] in #654
• Convert documentation from RST to Markdown by @laughingman7743 in #657
• Add header banner image to documentation by @laughingman7743 in #658

Full Changelog: v3.26.0...v3.27.0