ARROW-854: [Format] Add tentative SparseTensor format#2546

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mrkn wants to merge 40 commits intoapache:masterfrom

mrkn:sparse_tensor_proposal

Commits on Jan 9, 2019

Add tentative SparseTensor format
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Fix syntax error in SparseTensor.fbs
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Add SparseTensor.fbs in FBS_SRC
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Add header comments in SparseTensor.fbs
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Add an example of COO format in comment
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Make indptr of CSR a buffer
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Add an example of the CSR format in comment
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Write sparse tensor format in IPC.md
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Insert additional padding in sparse tensor format
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Implement SparseTensor and SparseCOOIndex
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Change COO index matrix to column-major in a format description
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Add SparseCSRIndex
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Add SparseIndex::format_type
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Add SparseTensorBase
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Add SparseIndex::ToString()
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Add SparseTensorFormat
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Fix format
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Support IPC read and write of SparseTensor
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Fix format
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Unify Tensor.fbs and SparseTensor.fbs
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Add SparseTensorBase::Equals
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Remove needless virtual specifiers
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Fix SparseCSRIndex::ToString and add tests
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Add missing ARROW_EXPORT specifiers
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Fix coding style
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Fix typo in comments
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Put EXPERIMENTAL markn in comments
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Return Status::IOError instead of DCHECK if message header type is not matched
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Rename length to non_zero_length in SparseTensor
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Mark APIs for sparse tensor as EXPERIMENTAL
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Apply code formatter
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Capitalize member function name
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Use std::make_shared
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Remove needless function declaration
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Use substitution instead of constructor call
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Rename sparse tensor classes
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Add type aliases of sparse tensor types
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Rename too-verbose function name
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Merge sparse_tensor_format.h into sparse_tensor.h
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make format
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