Optimize some functions to subcolumns#24406
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CurtizJ merged 8 commits intoClickHouse:masterfrom Jun 9, 2021
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Test failures are unrelated. |
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Internal documentation ticket: DOCSUP-10293. |
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Changelog entry (a user-readable short description of the changes that goes to CHANGELOG.md):
Added optimization, that transforms some functions to reading of subcolumns to reduce amount of read data. E.g., statement
col IS NULLis transformed to reading of subcolumncol.null. Optimization can be enabled by settingoptimize_functions_to_subcolumns.Detailed description / Documentation draft:
Part of #14196.