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Unnecessary getFileStatus() calls on all part-files in ParquetInputFormat.getSplits

[Dmitriy V. Ryaboy](https://issues.apache.org/jira/browse/PARQUET-16?#comment-14057953) / @dvryaboy: Could you check how this interacts with https://github.com/apache/incubator-parquet-mr/pull/2 ?

Unnecessary getFileStatus() calls on all part-files in ParquetInputFormat.getSplits

[Cheng Lian](https://issues.apache.org/jira/browse/PARQUET-16?#comment-14058231) / @liancheng: Hi @dvryaboy, thanks for pointing out that PR, the background information is very helpful. Actually I can make my change compatible with that PR. Essentially the...

HTTP Cache Manager only sends If-None-Match header

**Matt Parker** ([migrated from Bugzilla](https://bz.apache.org/bugzilla//show_bug.cgi?id=56163&redirect=false#c1)): I now see that http://tools.ietf.org/html/rfc2616#section-14.26 says of If-None-Match: "It is also used to prevent a method (e.g. PUT) from inadvertently modifying an existing resource when...

filter2 API performance regression

[Viktor Szathmáry](https://issues.apache.org/jira/browse/PARQUET-98?#comment-14161888) / @phraktle: Any thoughts on this? No change with 1.6.0rc3.

filter2 API performance regression

[Viktor Szathmáry](https://issues.apache.org/jira/browse/PARQUET-98?#comment-14224516) / @phraktle: anyone out there? :)

filter2 API performance regression

[Ryan Blue](https://issues.apache.org/jira/browse/PARQUET-98?#comment-14224897) / @rdblue: Could you try out the problem data with VisualVM or another profiling tool to see if there's anything funny going on? It doesn't look like your...

filter2 API performance regression

[Viktor Szathmáry](https://issues.apache.org/jira/browse/PARQUET-98?#comment-14232092) / @phraktle: My initial impression based on a quick profiling run is that it was creating a whole lot more garbage, seemingly instantiating all the protobufs (or just...