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Posted to commits@druid.apache.org by GitBox <gi...@apache.org> on 2019/05/30 15:32:38 UTC
[GitHub] [incubator-druid] xueyumusic opened a new pull request #7801:
Support var_pop, var_samp, stddev_pop and stddev_samp etc in sql
xueyumusic opened a new pull request #7801: Support var_pop, var_samp, stddev_pop and stddev_samp etc in sql
URL: https://github.com/apache/incubator-druid/pull/7801
Current extension-core has `stats` module which could computes variance population(sample) and standard deviation population(sample). We could expose them in sql based on calcite's var_pop,var_samp,stddev_pop,stddev_samp etc operators.
The main modifications are:
1. add `BaseVarianceSqlAggregator`
2. add tests `VarianceSqlAggregatorTest`
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