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Merge pull request #46166 from ClickHouse/vdimir/doc/optimize_rewrite_aggregate_function_with_if
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@ -3310,6 +3310,15 @@ SELECT
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FROM fuse_tbl
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```
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## optimize_rewrite_aggregate_function_with_if
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Rewrite aggregate functions with if expression as argument when logically equivalent.
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For example, `avg(if(cond, col, null))` can be rewritten to `avgOrNullIf(cond, col)`. It may improve performance.
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:::note
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Supported only with experimental analyzer (`allow_experimental_analyzer = 1`).
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:::
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## allow_experimental_database_replicated {#allow_experimental_database_replicated}
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Enables to create databases with [Replicated](../../engines/database-engines/replicated.md) engine.
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