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[ARROW-5354] [C++] allow Array to have null buffers when all elements are null - Arrow - [issue]
...In the case of all elements of an array being null, no buffers whatsoever need to be allocated (similar to NullArray). This is a more extreme case of the optimization which allows the null b...
http://issues.apache.org/jira/browse/ARROW-5354    Author: Benjamin Kietzman , 2019-05-17, 22:53
[ARROW-5326] [C++] Implement MapType, MapArray, MapBuilder - Arrow - [issue]
...Add implementation of MapType https://github.com/apache/arrow/blob/master/format/Schema.fbs#L55-L82...
http://issues.apache.org/jira/browse/ARROW-5326    Author: Benjamin Kietzman , 2019-05-15, 18:55
[ARROW-5327] [C++] allow construction of ArrayBuilders from existing arrays - Arrow - [issue]
...After calling Finish it may become necessary to append further elements to an array, which we don't currently support. One way to support this would be consuming the array to produce a build...
http://issues.apache.org/jira/browse/ARROW-5327    Author: Benjamin Kietzman , 2019-05-15, 16:43
[ARROW-5299] [C++] ListArray comparison is incorrect - Arrow - [issue]
...Equality comparison for ListArray accounts for offsets incorrectly, so slices of ListArrays with identical offsets but differing values will sometimes compare equal.For example, the followin...
http://issues.apache.org/jira/browse/ARROW-5299    Author: Benjamin Kietzman , 2019-05-15, 14:30
[ARROW-4708] [C++] Add multithreaded JSON reader - Arrow - [issue]
...The JSON reader currently only parses from a single, contiguous buffer and only in a single thread. This would be much more useful if it supported multithreaded parsing from a stream, as CSV...
http://issues.apache.org/jira/browse/ARROW-4708    Author: Benjamin Kietzman , 2019-05-03, 19:02
[ARROW-5176] [Python] Automate formatting of python files - Arrow - [issue]
...[Black](https://github.com/ambv/black) is a tool for automatically formatting python code in ways which flake8 and our other linters approve of. Adding it to the project will allow m...
http://issues.apache.org/jira/browse/ARROW-5176    Author: Benjamin Kietzman , 2019-04-26, 20:27
[ARROW-4698] [C++] Let StringBuilder be constructible with a pre allocated buffer for character data - Arrow - [issue]
...This is useful for example when an existing buffer can be immediately reused. This is currently used for [storage of strings in json parsing](https://github.com/apache/arrow/blob/mas...
http://issues.apache.org/jira/browse/ARROW-4698    Author: Benjamin Kietzman , 2019-04-22, 14:55
[ARROW-5151] [C++] Support take from UnionArray, ListArray, StructArray - Arrow - [issue]
...arrow::compute::Take cannot take from UnionArray, ListArray, or StructArray....
http://issues.apache.org/jira/browse/ARROW-5151    Author: Benjamin Kietzman , 2019-04-09, 17:14
[ARROW-5121] [C++] arrow::internal::make_unique conflicts std::make_unique on MSVC - Arrow - [issue]
...MSVC appears to implement c++20 ADL, which includes function templates with explicit template arguments (previously these were not looked up through ADL):https://ci.appveyor.com/project/Apac...
http://issues.apache.org/jira/browse/ARROW-5121    Author: Benjamin Kietzman , 2019-04-04, 18:50
[ARROW-4520] [C++] DCHECK custom messages are unreachable in release - Arrow - [issue]
...For release builds, DCHECK( x ) << y << z; currently expands to((void)(x)); while (false) ::arrow::util::ArrowLogBase() << y << z;This is unreachable which is an erro...
http://issues.apache.org/jira/browse/ARROW-4520    Author: Benjamin Kietzman , 2019-04-02, 02:03