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Merge branch 'master' of github.com:yandex/ClickHouse

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Alexey Milovidov 2017-06-05 23:18:27 +03:00
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6
doc/reference/en/agg_functions/index.rst
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@ -273,12 +273,12 @@ Examples: ``uniqArrayIf(arr, cond)``, ``quantilesTimingArrayIf(level1, level2)(
-State combinator
------------
If this combinator is used, the aggregate function returns a non-finished value (for example, in the case of the uniq function, the number of unique values), and the intermediate aggregation state (for example, in the case of the uniq function, a hash table for calculating the number of unique values) AggregateFunction (...) and can be used for further processing or can be stored in a table for subsequent pre-aggregation - see the sections "AggregatingMergeTree" and "functions for working with intermediate aggregation states".
If this combinator is used, the aggregate function returns a non-completed/non-finished value (for example, in the case of the ``uniq`` function, the number of unique values), and the intermediate aggregation state (for example, in the case of the ``uniq`` function, a hash table for calculating the number of unique values), which has type of ``AggregateFunction(...)`` and can be used for further processing or can be saved to a table for subsequent pre-aggregation - see the sections "AggregatingMergeTree" and "functions for working with intermediate aggregation states".
-Merge combinator
------------
In the case of using this combinator, the aggregate function will take as an argument the intermediate state of aggregation, pre-aggregate (combine together) these states, and return the finished value.
In the case of using this combinator, the aggregate function will take as an argument the intermediate state of an aggregation, pre-aggregate (combine together) these states, and return the finished/complete value.
-MergeState combinator
----------------
Merges the intermediate aggregation states, similar to the -Merge combo, but returns a non-ready value, and an intermediate aggregation state, similar to the -State combinator.
Merges the intermediate aggregation states, similar to the -Merge combinator, but returns a non-complete value, but an intermediate aggregation state, similar to the -State combinator.

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website/reference_en.html
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@ -6479,8 +6479,18 @@ The -%%If%% and -%%Array%% combinators can be used together. However, 'Array
==-State combinator==
If this combinator is used, the aggregate function returns a non-completed/non-finished value (for example, in the case of the `uniq` function, the number of unique values), and the intermediate aggregation state (for example, in the case of the `uniq` function, a hash table for calculating the number of unique values), which has type of %%AggregateFunction(...)%% and can be used for further processing or can be saved to a table for subsequent pre-aggregation - see the sections "AggregatingMergeTree" and "functions for working with intermediate aggregation states".
==-Merge combinator==
In the case of using this combinator, the aggregate function will take as an argument the intermediate state of an aggregation, pre-aggregate (combine together) these states, and return the finished/complete value.
==-MergeState combinator==
Merges the intermediate aggregation states, similar to the -Merge combinator, but returns a non-complete value, but an intermediate aggregation state, similar to the -State combinator.
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