Add customizable PARTITION BY support for ClickHouse tables #164
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- Add partition_bys config option similar to indexes with database/table filtering - Support custom PARTITION BY expressions to override default intDiv(id, 4294967) - Useful for time-based partitioning like toYYYYMM(created_at) for Snowflake IDs - Maintains backward compatibility with existing default behavior - Add test verification for custom partition_by functionality Fixes #161
- Add proper deterministic partition_by expression: intDiv(id, 1000000) - Update test to verify custom vs default partition expressions - Ensure both CONFIG_FILE and CONFIG_FILE_MARIADB tests pass - Fix CI failures caused by non-deterministic partition expressions
jaredmdobson
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Nov 5, 2025
* Add partition_bys config option similar to indexes with database/table filtering * Support custom PARTITION BY expressions to override default intDiv(id, 4294967) * Useful for time-based partitioning like toYYYYMM(created_at) for Snowflake IDs * Maintains backward compatibility with existing default behavior * Add test verification for custom partition_by functionality Fixes bakwc#161
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Summary
Adds support for customizable
PARTITION BYexpressions in ClickHouse table creation to address issues with Snowflake IDs creating too many partitions.Changes
partition_byswith database/table filtering (similar toindexes)intDiv(id, 4294967)with user-defined partition logicConfiguration Example
Problem Solved
Fixes issue where Snowflake-style IDs (e.g.,
1849360358546407424) with default partitioning create excessive partitions, triggeringmax_partitions_per_insert_blocklimits. Users can now specify time-based partitioning liketoYYYYMM(created_at).Fixes #161