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Added ReplacingMergeTree to README

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Itai Shirav 2017-04-04 15:29:24 +03:00
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@ -380,6 +380,10 @@ For a ``SummingMergeTree`` you can optionally specify the summing columns::
engine = engines.SummingMergeTree('EventDate', ('OrderID', 'EventDate', 'BannerID'),
summing_cols=('Shows', 'Clicks', 'Cost'))
For a ``ReplacingMergeTree`` you can optionally specify the version column::
engine = engines.ReplacingMergeTree('EventDate', ('OrderID', 'EventDate', 'BannerID'), ver_col='Version')
A ``Buffer`` engine is available for BufferModels. (See below how to use BufferModel). You can specify following parameters::
engine = engines.Buffer(Person) # you need to initialize engine with main Model. Other default parameters will be used