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Merge pull request #48188 from ClickHouse/rfraposa-5

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Add cross_to_inner_join_rewrite setting
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robot-ch-test-poll 2023-03-30 08:18:07 +02:00 committed by GitHub
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docs/en/sql-reference/statements/select/join.md
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@ -47,6 +47,7 @@ The default join type can be overridden using [join_default_strictness](../../..
The behavior of ClickHouse server for `ANY JOIN` operations depends on the [any_join_distinct_right_table_keys](../../../operations/settings/settings.md#any_join_distinct_right_table_keys) setting.
**See also**
- [join_algorithm](../../../operations/settings/settings.md#settings-join_algorithm)
@ -57,6 +58,8 @@ The behavior of ClickHouse server for `ANY JOIN` operations depends on the [any_
- [join_on_disk_max_files_to_merge](../../../operations/settings/settings.md#join_on_disk_max_files_to_merge)
- [any_join_distinct_right_table_keys](../../../operations/settings/settings.md#any_join_distinct_right_table_keys)
Use the `cross_to_inner_join_rewrite` setting to define the behavior when ClickHouse fails to rewrite a `CROSS JOIN` as an `INNER JOIN`. The default value is `1`, which allows the join to continue but it will be slower. Set `cross_to_inner_join_rewrite` to `0` if you want an error to be thrown, and set it to `2` to not run the cross joins but instead force a rewrite of all comma/cross joins. If the rewriting fails when the value is `2`, you will receive an error message stating "Please, try to simplify `WHERE` section".
## ON Section Conditions
An `ON` section can contain several conditions combined using the `AND` and `OR` operators. Conditions specifying join keys must refer both left and right tables and must use the equality operator. Other conditions may use other logical operators but they must refer either the left or the right table of a query.