pyarrow.orc.ORCFile¶

class pyarrow.orc.ORCFile(source)[source]¶

Bases: object

Reader interface for a single ORC file

Parameters: source (str or pyarrow.io.NativeFile) – Readable source. For passing Python file objects or byte buffers, see pyarrow.io.PythonFileInterface or pyarrow.io.BufferReader.

__init__(source)[source]¶: Initialize self. See help(type(self)) for accurate signature.

Methods

`__init__`(source)	Initialize self.
`read`([columns])	Read the whole file.
`read_stripe`(n[, columns])	Read a single stripe from the file.

Attributes

`nrows`	The number of rows in the file
`nstripes`	The number of stripes in the file
`schema`	The file schema, as an arrow schema

read(columns=None)[source]¶

Read the whole file.

Parameters: 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’
Returns: pyarrow.lib.Table – Content of the file as a Table.

read_stripe(n, columns=None)[source]¶

Read a single stripe from the file.

Parameters

n (int) – The stripe index
columns (list) – If not None, only these columns will be read from the stripe. A column name may be a prefix of a nested field, e.g. ‘a’ will select ‘a.b’, ‘a.c’, and ‘a.d.e’

Returns

pyarrow.lib.RecordBatch – Content of the stripe as a RecordBatch.