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Posted to github@beam.apache.org by GitBox <gi...@apache.org> on 2020/12/04 19:02:40 UTC
[GitHub] [beam] robertwb opened a new pull request #13489: Workaround for incremental in read_json.
robertwb opened a new pull request #13489:
URL: https://github.com/apache/beam/pull/13489
------------------------
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[GitHub] [beam] TheNeuralBit commented on a change in pull request #13489: Workaround for incremental in read_json.
Posted by GitBox <gi...@apache.org>.
TheNeuralBit commented on a change in pull request #13489:
URL: https://github.com/apache/beam/pull/13489#discussion_r541397740
##########
File path: sdks/python/apache_beam/dataframe/io.py
##########
@@ -59,6 +59,11 @@ def read_fwf(path, *args, **kwargs):
def read_json(path, *args, **kwargs):
+ if 'nrows' in kwargs:
+ raise NotImplementedError('nrows not yet supported')
+ elif kwargs.get('lines', False):
+ # Work around https://github.com/pandas-dev/pandas/issues/34548.
+ kwargs = dict(kwargs, nrows=1 << 63)
Review comment:
The motivation isn't clear to me from that issue, could you clarify?
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[GitHub] [beam] TheNeuralBit merged pull request #13489: Workaround for incremental in read_json.
Posted by GitBox <gi...@apache.org>.
TheNeuralBit merged pull request #13489:
URL: https://github.com/apache/beam/pull/13489
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[GitHub] [beam] TheNeuralBit commented on a change in pull request #13489: Workaround for incremental in read_json.
Posted by GitBox <gi...@apache.org>.
TheNeuralBit commented on a change in pull request #13489:
URL: https://github.com/apache/beam/pull/13489#discussion_r541462698
##########
File path: sdks/python/apache_beam/dataframe/io.py
##########
@@ -59,6 +59,11 @@ def read_fwf(path, *args, **kwargs):
def read_json(path, *args, **kwargs):
+ if 'nrows' in kwargs:
+ raise NotImplementedError('nrows not yet supported')
+ elif kwargs.get('lines', False):
+ # Work around https://github.com/pandas-dev/pandas/issues/34548.
+ kwargs = dict(kwargs, nrows=1 << 63)
Review comment:
Ah ok, thanks
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[GitHub] [beam] robertwb commented on a change in pull request #13489: Workaround for incremental in read_json.
Posted by GitBox <gi...@apache.org>.
robertwb commented on a change in pull request #13489:
URL: https://github.com/apache/beam/pull/13489#discussion_r541425726
##########
File path: sdks/python/apache_beam/dataframe/io.py
##########
@@ -59,6 +59,11 @@ def read_fwf(path, *args, **kwargs):
def read_json(path, *args, **kwargs):
+ if 'nrows' in kwargs:
+ raise NotImplementedError('nrows not yet supported')
+ elif kwargs.get('lines', False):
+ # Work around https://github.com/pandas-dev/pandas/issues/34548.
+ kwargs = dict(kwargs, nrows=1 << 63)
Review comment:
Due to a bug in the code, the entire file is read into memory all at once unless both chunksize *and* nrows are set.
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