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import logging
import itertools
from typing import Generator, Sequence, Tuple
from clickhouse_connect.driver.common import empty_gen, StreamContext
from clickhouse_connect.driver.exceptions import StreamClosedError
from clickhouse_connect.driver.types import Closable
from clickhouse_connect.driver.options import np, pd
logger = logging.getLogger(__name__)
# pylint: disable=too-many-instance-attributes
class NumpyResult(Closable):
def __init__(self,
block_gen: Generator[Sequence, None, None] = None,
column_names: Tuple = (),
column_types: Tuple = (),
d_types: Sequence = (),
source: Closable = None):
self.column_names = column_names
self.column_types = column_types
self.np_types = d_types
self.source = source
self.query_id = ''
self.summary = {}
self._block_gen = block_gen or empty_gen()
self._numpy_result = None
self._df_result = None
def _np_stream(self) -> Generator:
if self._block_gen is None:
raise StreamClosedError
block_gen = self._block_gen
self._block_gen = None
if not self.np_types:
return block_gen
d_types = self.np_types
first_type = d_types[0]
if first_type != np.object_ and all(np.dtype(np_type) == first_type for np_type in d_types):
self.np_types = first_type
def numpy_blocks():
for block in block_gen:
yield np.array(block, first_type).transpose()
else:
if any(x == np.object_ for x in d_types):
self.np_types = [np.object_] * len(self.np_types)
self.np_types = np.dtype(list(zip(self.column_names, d_types)))
def numpy_blocks():
for block in block_gen:
np_array = np.empty(len(block[0]), dtype=self.np_types)
for col_name, data in zip(self.column_names, block):
np_array[col_name] = data
yield np_array
return numpy_blocks()
def _df_stream(self) -> Generator:
if self._block_gen is None:
raise StreamClosedError
block_gen = self._block_gen
def pd_blocks():
for block in block_gen:
yield pd.DataFrame(dict(zip(self.column_names, block)))
self._block_gen = None
return pd_blocks()
def close_numpy(self):
if not self._block_gen:
raise StreamClosedError
chunk_size = 4
pieces = []
blocks = []
for block in self._np_stream():
blocks.append(block)
if len(blocks) == chunk_size:
pieces.append(np.concatenate(blocks, dtype=self.np_types))
chunk_size *= 2
blocks = []
pieces.extend(blocks)
if len(pieces) > 1:
self._numpy_result = np.concatenate(pieces, dtype=self.np_types)
elif len(pieces) == 1:
self._numpy_result = pieces[0]
else:
self._numpy_result = np.empty((0,))
self.close()
return self
def close_df(self):
if self._block_gen is None:
raise StreamClosedError
bg = self._block_gen
chain = itertools.chain
chains = [chain(b) for b in zip(*bg)]
new_df_series = []
for c in chains:
new_df_series.append(pd.concat([pd.Series(piece, copy=False) for piece in c],
copy=False, ignore_index=True))
self._df_result = pd.DataFrame(dict(zip(self.column_names, new_df_series)))
self.close()
return self
@property
def np_result(self):
if self._numpy_result is None:
self.close_numpy()
return self._numpy_result
@property
def df_result(self):
if self._df_result is None:
self.close_df()
return self._df_result
@property
def np_stream(self) -> StreamContext:
return StreamContext(self, self._np_stream())
@property
def df_stream(self) -> StreamContext:
return StreamContext(self, self._df_stream())
def close(self):
if self._block_gen is not None:
self._block_gen.close()
self._block_gen = None
if self.source:
self.source.close()
self.source = None
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