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[SPARK-29376][SQL][PYTHON] Upgrade Apache Arrow to version 0.15.1
### What changes were proposed in this pull request? Upgrade Apache Arrow to version 0.15.1. This includes Java artifacts and increases the minimum required version of PyArrow also. Version 0.12.0 to 0.15.1 includes the following selected fixes/improvements relevant to Spark users: * ARROW-6898 - [Java] Fix potential memory leak in ArrowWriter and several test classes * ARROW-6874 - [Python] Memory leak in Table.to_pandas() when conversion to object dtype * ARROW-5579 - [Java] shade flatbuffer dependency * ARROW-5843 - [Java] Improve the readability and performance of BitVectorHelper#getNullCount * ARROW-5881 - [Java] Provide functionalities to efficiently determine if a validity buffer has completely 1 bits/0 bits * ARROW-5893 - [C++] Remove arrow::Column class from C++ library * ARROW-5970 - [Java] Provide pointer to Arrow buffer * ARROW-6070 - [Java] Avoid creating new schema before IPC sending * ARROW-6279 - [Python] Add Table.slice method or allow slices in \_\_getitem\_\_ * ARROW-6313 - [Format] Tracking for ensuring flatbuffer serialized values are aligned in stream/files. * ARROW-6557 - [Python] Always return pandas.Series from Array/ChunkedArray.to_pandas, propagate field names to Series from RecordBatch, Table * ARROW-2015 - [Java] Use Java Time and Date APIs instead of JodaTime * ARROW-1261 - [Java] Add container type for Map logical type * ARROW-1207 - [C++] Implement Map logical type Changelog can be seen at https://arrow.apache.org/release/0.15.0.html ### Why are the changes needed? Upgrade to get bug fixes, improvements, and maintain compatibility with future versions of PyArrow. ### Does this PR introduce any user-facing change? No ### How was this patch tested? Existing tests, manually tested with Python 3.7, 3.8 Closes apache#26133 from BryanCutler/arrow-upgrade-015-SPARK-29376. Authored-by: Bryan Cutler <cutlerb@gmail.com> Signed-off-by: HyukjinKwon <gurwls223@apache.org>
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