guiyanakuang commented on a change in pull request #915:
URL: https://github.com/apache/orc/pull/915#discussion_r713539981
##########
File path: java/core/pom.xml
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@@ -75,6 +75,10 @@
<groupId>org.threeten</groupId>
<artifactId>threeten-extra</artifactId>
</dependency>
+ <dependency>
+ <groupId>com.tdunning</groupId>
Review comment:
> This reminds me the following Spark PR. In the community, it's a
little hard to add this kind of dependency without a significant justification.
>
> *
https://github.com/apache/spark/pull/26197/files#diff-283ead138b37209525130359830c4c6eeafaf5c6639b0df82b770389d24002bfR134
I understand the point and the fear of not being maintained. But the actual
algorithm is short and easy to understand.
>
https://github.com/addthis/stream-lib/blob/master/src/main/java/com/clearspring/analytics/stream/quantile/TDigest.java
Can I copy this file into the ORC project instead of the dependency?
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