Improvements

• Comprehensive ClickHouse JOIN support in SQLAlchemy via ch_join() with all strictness/distribution modifiers and USING syntax (#635, #636)
• Multi-column array_join() for parallel array expansion (#633)
• Add missing Replicated engine variants (ReplicatedReplacingMergeTree, etc.) (#687)
• Lazy imports for numpy, pandas, pyarrow, and polars, ~4x faster bare import time (#589)

Bug Fixes

• Fix .final() and .sample() silently overwriting each other when chained (#658)
• Fix sqlalchemy.values() to emit ClickHouse VALUES table function syntax (#681)
• Fix GraphiteMergeTree to properly quote config_section argument

Other

• Remove py.typed marker that was causing false type errors for mypy/pyright users (#691)

Full Changelog: v0.14.1...v0.15.0