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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.
c l t j | _ | j j | y N)_orc ORCReaderreaderopen)selfsources Q/mnt/ssd/data/python-lab/Trading/venv/lib/python3.12/site-packages/pyarrow/orc.py__init__zORCFile.__init__& s" nn& c 6 | j j S )z/The file metadata, as an arrow KeyValueMetadata)r metadatar s r r zORCFile.metadata* {{##%%r c 6 | j j S )z#The file schema, as an arrow schema)r schemar s r r zORCFile.schema/ s {{!!##r c 6 | j j S )z The number of rows in the file)r nrowsr s r r z
ORCFile.nrows4 s {{ ""r c 6 | j j S )z!The number of stripes in the file)r nstripesr s r r zORCFile.nstripes9 r r c 6 | j j S )z4Format version of the ORC file, must be 0.11 or 0.12)r file_versionr s r r zORCFile.file_version> s {{''))r c 6 | j j S )z2Software instance and version that wrote this file)r software_versionr s r r zORCFile.software_versionC {{++--r c 6 | j j S )z Compression codec of the file)r compressionr s r r# zORCFile.compressionH {{&&((r c 6 | j j S )z?Number of bytes to buffer for the compression codec in the file)r compression_sizer s r r& zORCFile.compression_sizeM r! r c 6 | j j S )z{Name of the writer that wrote this file.
If the writer is unknown then its Writer ID
(a number) is returned)r writerr s r r( zORCFile.writerR s
{{!!##r c 6 | j j S )zVersion of the writer)r writer_versionr s r r* zORCFile.writer_versionY {{))++r c 6 | j j S )zRNumber of rows per an entry in the row index or 0
if there is no row index)r row_index_strider s r r- zORCFile.row_index_stride^ s {{++--r c 6 | j j S )zNumber of stripe statistics)r nstripe_statisticsr s r r/ zORCFile.nstripe_statisticsd {{--//r c 6 | j j S )z/Length of the data stripes in the file in bytes)r content_lengthr s r r2 zORCFile.content_lengthi r+ r c 6 | j j S )z`_
is the older version
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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
Parameters
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where : str or pyarrow.io.NativeFile
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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
N)rh r( write)r tables r rv zORCWriter.write s" ||| % r c ` | j r"| j j d| _ yy)z$
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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