v.21.11Improvements

Allow LowCardinality Columns in ORC Format

Official CH changelog text
Allow to input and output LowCardinality columns in ORC input/output format. #29062 (Kruglov Pavel).
Added support for reading and writing LowCardinality columns in the ORC input/output format in ClickHouse.

Why it matters

This feature enables efficient storage and processing of low cardinality data when using the ORC format, improving compatibility and performance for users working with ORC files that contain LowCardinality typed columns.

How to use it

Users can now seamlessly import and export tables with LowCardinality columns using the ORC format. The feature works transparently when reading from or writing to ORC files via the usual INPUT and OUTPUT clauses specifying the ORC format.

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