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[ARROW-3396] VectorSchemaRoot.create(schema, allocator) doesn't create dictionary encoded vector correctly - Arrow - [issue]
http://issues.apache.org/jira/browse/ARROW-3396    Author: Li Jin , 2018-10-17, 16:40
[ARROW-3497] [Java] Add user documentation for achieving better performance - Arrow - [issue]
http://issues.apache.org/jira/browse/ARROW-3497    Author: Li Jin , 2018-10-12, 08:45
[ARROW-3496] [Java] Add microbenchmark code to Java - Arrow - [issue]
...Animesh Trivedi has done some microbenchmarking with the Java API. Let's consider adding them to the codebase....
http://issues.apache.org/jira/browse/ARROW-3496    Author: Li Jin , 2018-10-12, 08:45
[ARROW-3495] [Java] Optimize bit operations performance - Arrow - [issue]
...From Animesh Trivedi's benchmark finding:2) Materialize values from Validity and Value direct buffers instead ofcalling getInt() function on the IntVector. This is implemented as a newUnsafe...
http://issues.apache.org/jira/browse/ARROW-3495    Author: Li Jin , 2018-10-12, 08:45
[ARROW-3493] [Java] Document BOUNDS_CHECKING_ENABLED - Arrow - [issue]
...According to Animesh Trivedi, BOUNDS_CHECKING_ENABLED has significant implication on performance.We should document this better and maybe revisit the default value. https://github.com/apache...
http://issues.apache.org/jira/browse/ARROW-3493    Author: Li Jin , 2018-10-12, 08:45
[expand - 1 more] - [JAVA] Arrow performance measurement - Arrow - [mail # dev]
...I have created these as the first step. Animesh, feel free to submit PR forthese. I will look into your micro benchmarks soon.   1. [image: Improvement] ARROW-3497[Java] Add user d...
   Author: Li Jin , 2018-10-11, 15:55
[JAVA] Total row count of an Arrow file - Arrow - [mail # dev]
...Hi Michael,I think ArrowFileReader takes SeekableByteChannel so it's possible to onlyread the metadata for each record batches and skip the data. However it isnot implemented.If the input Ch...
   Author: Li Jin , 2018-09-21, 14:32
[expand - 1 more] - [DISCUSS] Standardize Java style - Arrow - [mail # dev]
...Bryan,I agree that the some every google style rules might not be the best fitfor Arrow project (e.g. import order rules). Like you said, we can usegoogle style as a base line and tweak spec...
   Author: Li Jin , 2018-08-28, 13:27
[expand - 1 more] - Progress on Arrow RPC a.k.a. Arrow Flight - Arrow - [mail # dev]
...Thank you both for the explanation, it makes sense.Another feedback I have is around flight.proto - some of the message (suchas FlightDescriptor and FlightPutInstruction) is not very clear t...
   Author: Li Jin , 2018-08-27, 15:13
Contribute "RowSet" mechanism from Apache Drill? - Arrow - [mail # dev]
...Hi Paul,Thank you for the email. I think this is interesting.Arrow (Java API) currently doesn't have the capability of automaticallylimiting the memory size of record batches. In Spark we ha...
   Author: Li Jin , 2018-08-27, 14:00