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blinkov
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Dec 4, 2018
| - Provide additional logic when data parts merging in the [CollapsingMergeTree](collapsingmergetree.md#table_engine-collapsingmergetree) and [SummingMergeTree](summingmergetree.md#table_engine-summingmergetree) engines. | ||
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| You may need many fields in the primary key even if they are not necessary for the previous steps. | ||
| If you need this, it makes sense to specify the *sorting key* that is distinct from the primary key. |
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If you need this -> In some cases ?
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This comment applies specifically to the case when the user needs additional merge logic (specified in the bullet point above).
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| <a name="table_engines-mergetree-sorting_key"></a> | ||
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| ### Choosing the Sorting Key that is distinct from the Primary Key |
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"distinct" might get confused with keyword, I'd just say "...Sorting Key that Differs from The Primary Key"
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