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In [1]: paste
import pandas as pd
import feather

data = {'date': ['2014-05-01 18:47:05.069722', '2014-05-01 18:47:05.119994', 
                 '2014-05-02 18:47:05.178768', '2014-05-02 18:47:05.230071', 
                 '2014-05-02 18:47:05.230071', '2014-05-02 18:47:05.280592']}
df = pd.DataFrame(data, columns = ['date'])

df['date'] = pd.to_datetime(df['date']).dt.date

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$ ll /usr/lib/llvm-6.0/lib
total 163836
-rw-r--r-- 1 root root    14600 Oct 18 13:44 BugpointPasses.so
drwxr-xr-x 3 root root     4096 Jun  2 19:58 clang/
drwxr-xr-x 5 root root     4096 Jun  2 19:58 cmake/
lrwxrwxrwx 1 root root       40 Oct 18 13:44 libclang-6.0.so.1 -> ../../x86_64-linux-gnu/libclang-6.0.so.1
lrwxrwxrwx 1 root root       17 Oct 18 13:44 libclang.so.1 -> libclang-6.0.so.1
-rw-r--r-- 1 root root   591060 Oct 18 13:44 libFuzzer.a
lrwxrwxrwx 1 root root       39 Oct 18 13:44 libLLVM-6.0.1.so -> ../../x86_64-linux-gnu/libLLVM-6.0.so.1
lrwxrwxrwx 1 root root       39 Oct 18 13:44 libLLVM-6.0.1.so.1 -> ../../x86_64-linux-gnu/libLLVM-6.0.so.1

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/arrow/r /
* checking for file './DESCRIPTION' ... OK
* preparing 'arrow':
* checking DESCRIPTION meta-information ... OK
* cleaning src
* running 'cleanup'
* checking for LF line-endings in source and make files and shell scripts
* checking for empty or unneeded directories
* building 'arrow_0.0.0.9000.tar.gz'

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diff --git a/cpp/src/parquet/.parquetcppversion b/cpp/src/parquet/.parquetcppversion
index d65937f10..f825f7c7f 100644
--- a/cpp/src/parquet/.parquetcppversion
+++ b/cpp/src/parquet/.parquetcppversion
@@ -1 +1 @@
-1.4.1-SNAPSHOT
+1.5.1-SNAPSHOT
diff --git a/cpp/src/parquet/arrow/arrow-reader-writer-test.cc b/cpp/src/parquet/arrow/arrow-reader-writer-test.cc
index 5f4e12349..086672711 100644
--- a/cpp/src/parquet/arrow/arrow-reader-writer-test.cc

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wesm

read_fastparquet()
  File "/home/wesm/miniconda/envs/arrow-dev/bin/ipython", line 11, in <module>
    sys.exit(start_ipython())
  File "/home/wesm/miniconda/envs/arrow-dev/lib/python3.6/site-packages/IPython/__init__.py", line 125, in start_ipython
    return launch_new_instance(argv=argv, **kwargs)
  File "/home/wesm/miniconda/envs/arrow-dev/lib/python3.6/site-packages/traitlets/config/application.py", line 658, in launch_instance
    app.start()
  File "/home/wesm/miniconda/envs/arrow-dev/lib/python3.6/site-packages/IPython/terminal/ipapp.py", line 356, in start
    self.shell.mainloop()
  File "/home/wesm/miniconda/envs/arrow-dev/lib/python3.6/site-packages/IPython/terminal/interactiveshell.py", line 485, in mainloop

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  File "/home/wesm/miniconda/envs/arrow-dev/bin/ipython", line 11, in <module>
    sys.exit(start_ipython())
  File "/home/wesm/miniconda/envs/arrow-dev/lib/python3.6/site-packages/IPython/__init__.py", line 125, in start_ipython
    return launch_new_instance(argv=argv, **kwargs)
  File "/home/wesm/miniconda/envs/arrow-dev/lib/python3.6/site-packages/traitlets/config/application.py", line 658, in launch_instance
    app.start()
  File "/home/wesm/miniconda/envs/arrow-dev/lib/python3.6/site-packages/IPython/terminal/ipapp.py", line 356, in start
    self.shell.mainloop()
  File "/home/wesm/miniconda/envs/arrow-dev/lib/python3.6/site-packages/IPython/terminal/interactiveshell.py", line 485, in mainloop
    self.interact()

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$ ./lint.sh 
/home/wesm/code/arrow/r/src/array.cpp had clang-format style issues
--- /home/wesm/code/arrow/r/src/array.cpp
+++ /home/wesm/code/arrow/r/src/array.cpp (after clang format)
@@ -40,9 +40,7 @@
 std::shared_ptr<arrow::Array> SimpleArray(SEXP x) {
   Rcpp::Vector<RTYPE> vec(x);
   std::vector<std::shared_ptr<arrow::Buffer>> buffers{
-    nullptr,
-    std::make_shared<SimpleRBuffer<RTYPE>>(vec)

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-- CMAKE_CXX_FLAGS: -D_GLIBCXX_USE_CXX11_ABI=0 -ggdb -O0  -Weverything -Wno-c++98-compat -Wno-c++98-compat-pedantic -Wno-deprecated -Wno-weak-vtables -Wno-padded -Wno-comma -Wno-unused-parameter -Wno-unused-template -Wno-undef -Wno-shadow -Wno-switch-enum -Wno-exit-time-destructors -Wno-global-constructors -Wno-weak-template-vtables -Wno-undefined-reinterpret-cast -Wno-implicit-fallthrough -Wno-unreachable-code-return -Wno-float-equal -Wno-missing-prototypes -Wno-old-style-cast -Wno-covered-switch-default -Wno-cast-align -Wno-vla-extension -Wno-shift-sign-overflow -Wno-used-but-marked-unused -Wno-missing-variable-declarations -Wno-gnu-zero-variadic-macro-arguments -Wconversion -Wno-sign-conversion -Wno-disabled-macro-expansion -Wno-gnu-folding-constant -Wno-reserved-id-macro -Wno-range-loop-analysis -Wno-double-promotion -Wno-undefined-func-template -Wno-zero-as-null-pointer-constant -Wno-unknown-warning-option -Werror -Wno-unknown-warning-option -std=c++11 -msse3 -maltivec -Werror -Qunused-arguments  -fsanit

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from pandas import DataFrame
from pandas.util.testing import set_trace
import os
import numpy as np
import matplotlib.pyplot as plt

dirs = []
names = []
lengths = []