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Reader interface for a single ORC file
Parameters
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source : str or pyarrow.NativeFile
Readable source. For passing Python file objects or byte buffers,
see pyarrow.io.PythonFileInterface or pyarrow.io.BufferReader.
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zORCFile.metadatac C r )z#The file schema, as an arrow schema)r schemar r r r
r / r zORCFile.schemac C r )z The number of rows in the file)r nrowsr r r r
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ORCFile.nrowsc C r )z!The number of stripes in the file)r nstripesr r r r
r 9 r zORCFile.nstripesc C r )z4Format version of the ORC file, must be 0.11 or 0.12)r file_versionr r r r
r > r zORCFile.file_versionc C r )z2Software instance and version that wrote this file)r software_versionr r r r
r C r zORCFile.software_versionc C r )z Compression codec of the file)r compressionr r r r
r H r zORCFile.compressionc C r )z?Number of bytes to buffer for the compression codec in the file)r compression_sizer r r r
r M r zORCFile.compression_sizec C r )z{Name of the writer that wrote this file.
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zORCFile.writerc C r )zVersion of the writer)r writer_versionr r r r
r Y r zORCFile.writer_versionc C r )zRNumber of rows per an entry in the row index or 0
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zORCFile.row_index_stridec C r )zNumber of stripe statistics)r nstripe_statisticsr r r r
r d r zORCFile.nstripe_statisticsc C r )z/Length of the data stripes in the file in bytes)r content_lengthr r r r
r i r zORCFile.content_lengthc C r )z`_
is the older version
while `Hive 0.12 / ORC v1 `_
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batch_size : int, default 1024
Number of rows the ORC writer writes at a time.
stripe_size : int, default 64 * 1024 * 1024
Size of each ORC stripe in bytes.
compression : string, default 'uncompressed'
The compression codec.
Valid values: {'UNCOMPRESSED', 'SNAPPY', 'ZLIB', 'LZ4', 'ZSTD'}
Note that LZ0 is currently not supported.
compression_block_size : int, default 64 * 1024
Size of each compression block in bytes.
compression_strategy : string, default 'speed'
The compression strategy i.e. speed vs size reduction.
Valid values: {'SPEED', 'COMPRESSION'}
row_index_stride : int, default 10000
The row index stride i.e. the number of rows per
an entry in the row index.
padding_tolerance : double, default 0.0
The padding tolerance.
dictionary_key_size_threshold : double, default 0.0
The dictionary key size threshold. 0 to disable dictionary encoding.
1 to always enable dictionary encoding.
bloom_filter_columns : None, set-like or list-like, default None
Columns that use the bloom filter.
bloom_filter_fpp : double, default 0.05
Upper limit of the false-positive rate of the bloom filter.
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Writer interface for a single ORC file
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see pyarrow.io.PythonFileInterface, pyarrow.io.BufferOutputStream
or pyarrow.io.FixedSizeBufferWriter.
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Write the table into an ORC file. The schema of the table must
be equal to the schema used when opening the ORC file.
Parameters
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table : pyarrow.Table
The table to be written into the ORC file
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Close the ORC file
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Read a Table from an ORC file.
Parameters
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source : str, pyarrow.NativeFile, or file-like object
If a string passed, can be a single file name. For file-like objects,
only read a single file. Use pyarrow.BufferReader to read a file
contained in a bytes or buffer-like object.
columns : list
If not None, only these columns will be read from the file. A column
name may be a prefix of a nested field, e.g. 'a' will select 'a.b',
'a.c', and 'a.d.e'. Output always follows the ordering of the file and
not the `columns` list. If empty, no columns will be read. Note
that the table will still have the correct num_rows set despite having
no columns.
filesystem : FileSystem, default None
If nothing passed, will be inferred based on path.
Path will try to be found in the local on-disk filesystem otherwise
it will be parsed as an URI to determine the filesystem.
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Write a table into an ORC file.
Parameters
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table : pyarrow.lib.Table
The table to be written into the ORC file
where : str or pyarrow.io.NativeFile
Writable target. For passing Python file objects or byte buffers,
see pyarrow.io.PythonFileInterface, pyarrow.io.BufferOutputStream
or pyarrow.io.FixedSizeBufferWriter.
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