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# Licensed to the Apache Software Foundation (ASF) under one
# or more contributor license agreements. See the NOTICE file
# distributed with this work for additional information
# regarding copyright ownership. The ASF licenses this file
# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
# with the License. You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing,
# software distributed under the License is distributed on an
# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
# KIND, either express or implied. See the License for the
# specific language governing permissions and limitations
# under the License.
# cython: profile=False
# distutils: language = c++
from cython.operator cimport dereference as deref
from libcpp.vector cimport vector as std_vector
from libcpp.utility cimport move
from pyarrow.includes.common cimport *
from pyarrow.includes.libarrow cimport *
from pyarrow.lib cimport (check_status, _Weakrefable,
MemoryPool, maybe_unbox_memory_pool,
Schema, pyarrow_wrap_schema,
KeyValueMetadata,
pyarrow_wrap_batch,
RecordBatch,
Table,
pyarrow_wrap_table,
pyarrow_unwrap_schema,
pyarrow_wrap_metadata,
pyarrow_unwrap_table,
get_reader,
get_writer)
from pyarrow.lib import tobytes
cdef class ORCReader(_Weakrefable):
cdef:
object source
CMemoryPool* allocator
unique_ptr[ORCFileReader] reader
def __cinit__(self, MemoryPool memory_pool=None):
self.allocator = maybe_unbox_memory_pool(memory_pool)
def open(self, object source, c_bool use_memory_map=True):
cdef:
shared_ptr[CRandomAccessFile] rd_handle
self.source = source
get_reader(source, use_memory_map, &rd_handle)
with nogil:
self.reader = move(GetResultValue(
ORCFileReader.Open(rd_handle, self.allocator)
))
def metadata(self):
"""
The arrow metadata for this file.
Returns
-------
metadata : pyarrow.KeyValueMetadata
"""
cdef:
shared_ptr[const CKeyValueMetadata] sp_arrow_metadata
with nogil:
sp_arrow_metadata = GetResultValue(
deref(self.reader).ReadMetadata()
)
return pyarrow_wrap_metadata(sp_arrow_metadata)
def schema(self):
"""
The arrow schema for this file.
Returns
-------
schema : pyarrow.Schema
"""
cdef:
shared_ptr[CSchema] sp_arrow_schema
with nogil:
sp_arrow_schema = GetResultValue(deref(self.reader).ReadSchema())
return pyarrow_wrap_schema(sp_arrow_schema)
def nrows(self):
return deref(self.reader).NumberOfRows()
def nstripes(self):
return deref(self.reader).NumberOfStripes()
def read_stripe(self, n, columns=None):
cdef:
shared_ptr[CRecordBatch] sp_record_batch
RecordBatch batch
int64_t stripe
std_vector[c_string] c_names
stripe = n
if columns is None:
with nogil:
sp_record_batch = GetResultValue(
deref(self.reader).ReadStripe(stripe)
)
else:
c_names = [tobytes(name) for name in columns]
with nogil:
sp_record_batch = GetResultValue(
deref(self.reader).ReadStripe(stripe, c_names)
)
return pyarrow_wrap_batch(sp_record_batch)
def read(self, columns=None):
cdef:
shared_ptr[CTable] sp_table
std_vector[c_string] c_names
if columns is None:
with nogil:
sp_table = GetResultValue(deref(self.reader).Read())
else:
c_names = [tobytes(name) for name in columns]
with nogil:
sp_table = GetResultValue(deref(self.reader).Read(c_names))
return pyarrow_wrap_table(sp_table)
cdef class ORCWriter(_Weakrefable):
cdef:
object source
unique_ptr[ORCFileWriter] writer
shared_ptr[COutputStream] rd_handle
def open(self, object source):
self.source = source
get_writer(source, &self.rd_handle)
with nogil:
self.writer = move(GetResultValue[unique_ptr[ORCFileWriter]](
ORCFileWriter.Open(self.rd_handle.get())))
def write(self, Table table):
cdef:
shared_ptr[CTable] sp_table
sp_table = pyarrow_unwrap_table(table)
with nogil:
check_status(deref(self.writer).Write(deref(sp_table)))
def close(self):
with nogil:
check_status(deref(self.writer).Close())
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