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    from 1a3b17b  PARQUET-1769: [C++] Update parquet.thrift to parquet-format 
2.8.0
     add 68b0e9c  ARROW-7578: [R] Add support for datasets with IPC files and 
with multiple sources

No new revisions were added by this update.

Summary of changes:
 cpp/src/arrow/dataset/api.h                  |   1 +
 cpp/src/arrow/dataset/dataset.h              |  17 ++--
 cpp/src/arrow/dataset/dataset_test.cc        |  18 ++--
 cpp/src/arrow/dataset/discovery.cc           |   4 +-
 cpp/src/arrow/dataset/discovery_test.cc      |   5 +-
 cpp/src/arrow/dataset/file_base.cc           |  44 ++++-----
 cpp/src/arrow/dataset/file_base.h            |  55 ++++++-----
 cpp/src/arrow/dataset/file_ipc.cc            |  52 ++++++----
 cpp/src/arrow/dataset/file_ipc_test.cc       |  14 ++-
 cpp/src/arrow/dataset/file_parquet_test.cc   |   2 +-
 cpp/src/arrow/dataset/scanner_test.cc        |   4 +-
 cpp/src/arrow/dataset/test_util.h            |   5 +-
 python/pyarrow/_dataset.pyx                  |  37 +++++---
 python/pyarrow/includes/libarrow_dataset.pxd |   8 +-
 python/pyarrow/ipc.py                        |   4 +-
 python/pyarrow/tests/test_dataset.py         |  12 ++-
 r/Makefile                                   |   2 +-
 r/NAMESPACE                                  |   1 +
 r/R/arrowExports.R                           |  24 +++--
 r/R/dataset.R                                | 136 +++++++++++++++++++--------
 r/man/DataSource.Rd                          |  24 +++--
 r/man/data_source.Rd                         |  57 +++++++++++
 r/man/open_dataset.Rd                        |  14 +--
 r/src/arrowExports.cpp                       |  79 +++++++++++++---
 r/src/dataset.cpp                            |  29 ++++--
 r/tests/testthat/test-dataset.R              |  54 ++++++++++-
 26 files changed, 503 insertions(+), 199 deletions(-)
 create mode 100644 r/man/data_source.Rd

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