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Only create NULL category columns where necessary #255

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jesteria opened this issue Dec 12, 2017 · 0 comments
Open

Only create NULL category columns where necessary #255

jesteria opened this issue Dec 12, 2017 · 0 comments
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collate performance

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@jesteria
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From @shaycrk on September 20, 2017 16:46

Presently (with the new imputation support), all categoricals will generate a NULL category column (so may create a number of columns with only zeros) -- in the future, we may want to clean this up by only creating this category where NULL values exist.

Copied from original issue: dssg/architect#46
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