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[BUG] Incorrect dtype inferred when a column with all nulls is stored in parquet file #6168

Closed
galipremsagar opened this issue Sep 8, 2020 · 3 comments · Fixed by #6511
Closed

[BUG] Incorrect dtype inferred when a column with all nulls is stored in parquet file #6168

galipremsagar opened this issue Sep 8, 2020 · 3 comments · Fixed by #6511
Labels
bug Something isn't working cuIO cuIO issue libcudf Affects libcudf (C++/CUDA) code. Python Affects Python cuDF API.

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@galipremsagar
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Describe the bug
When there is a column in dataframe with all nulls with dtype "object", cudf.read_parquet is inferring the dtype as int32 instead of "object" dtype.

Steps/Code to reproduce bug

In[30]: df = pd.DataFrame({"j":pd.Series([None, None, None], dtype='str')})
In[31]: df
Out[31]: 
      j
0  None
1  None
2  None
In[32]: df.to_parquet('t')
In[33]: pd.read_parquet('t')['j']
Out[33]: 
0    None
1    None
2    None
Name: j, dtype: object
In[34]: cudf.read_parquet('t')['j']
Out[34]: 
0    <NA>
1    <NA>
2    <NA>
Name: j, dtype: int32

Expected behavior
Expected behavior is to infer the dtype correctly in this scenario.

Environment overview (please complete the following information)

  • Environment location: Bare-metal
  • Method of cuDF install: from source

Environment details
Please run and paste the output of the cudf/print_env.sh script here, to gather any other relevant environment details

(cudf_dev11) pgali@pgali-HP-Z8-G4-Workstation:~/Desktop/cudf$ ./print_env.sh

 **git***
 commit 0a51abd7b25d0cb87bf2483b8456e88ef216a018 (HEAD -> 6001)
 Merge: c64dfcb9f6 d5606afac8
 Author: galipremsagar <[email protected]>
 Date:   Thu Sep 3 17:59:59 2020 -0500
 
 Merge remote-tracking branch 'upstream/branch-0.16' into 6001
 **git submodules***
 
 ***OS Information***
 DISTRIB_ID=Ubuntu
 DISTRIB_RELEASE=20.04
 DISTRIB_CODENAME=focal
 DISTRIB_DESCRIPTION="Ubuntu 20.04.1 LTS"
 NAME="Ubuntu"
 VERSION="20.04.1 LTS (Focal Fossa)"
 ID=ubuntu
 ID_LIKE=debian
 PRETTY_NAME="Ubuntu 20.04.1 LTS"
 VERSION_ID="20.04"
 HOME_URL="https://www.ubuntu.com/"
 SUPPORT_URL="https://help.ubuntu.com/"
 BUG_REPORT_URL="https://bugs.launchpad.net/ubuntu/"
 PRIVACY_POLICY_URL="https://www.ubuntu.com/legal/terms-and-policies/privacy-policy"
 VERSION_CODENAME=focal
 UBUNTU_CODENAME=focal
 Linux pgali-HP-Z8-G4-Workstation 5.4.0-45-generic #49-Ubuntu SMP Wed Aug 26 13:38:52 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux
 
 ***GPU Information***
 Mon Sep  7 19:37:22 2020
 +-----------------------------------------------------------------------------+
 | NVIDIA-SMI 450.66       Driver Version: 450.66       CUDA Version: 11.0     |
 |-------------------------------+----------------------+----------------------+
 | GPU  Name        Persistence-M| Bus-Id        Disp.A | Volatile Uncorr. ECC |
 | Fan  Temp  Perf  Pwr:Usage/Cap|         Memory-Usage | GPU-Util  Compute M. |
 |                               |                      |               MIG M. |
 |===============================+======================+======================|
 |   0  Quadro RTX 8000     Off  | 00000000:22:00.0 Off |                  Off |
 | 34%   56C    P2    63W / 260W |   1731MiB / 48601MiB |      0%      Default |
 |                               |                      |                  N/A |
 +-------------------------------+----------------------+----------------------+
 |   1  Quadro RTX 8000     Off  | 00000000:2D:00.0  On |                  Off |
 | 33%   43C    P8    26W / 260W |    397MiB / 48592MiB |      7%      Default |
 |                               |                      |                  N/A |
 +-------------------------------+----------------------+----------------------+
 
 +-----------------------------------------------------------------------------+
 | Processes:                                                                  |
 |  GPU   GI   CI        PID   Type   Process name                  GPU Memory |
 |        ID   ID                                                   Usage      |
 |=============================================================================|
 |    0   N/A  N/A       938      G   /usr/lib/xorg/Xorg                  4MiB |
 |    0   N/A  N/A      1787      G   /usr/lib/xorg/Xorg                  4MiB |
 |    0   N/A  N/A    157349      C   ...nvs/cudf_dev11/bin/python      573MiB |
 |    1   N/A  N/A       938      G   /usr/lib/xorg/Xorg                 39MiB |
 |    1   N/A  N/A      1787      G   /usr/lib/xorg/Xorg                157MiB |
 |    1   N/A  N/A      1989      G   /usr/bin/gnome-shell              165MiB |
 |    1   N/A  N/A      3983      G   /usr/lib/firefox/firefox            3MiB |
 |    1   N/A  N/A      4280      G   /usr/lib/firefox/firefox            3MiB |
 |    1   N/A  N/A      6439      G   /usr/lib/firefox/firefox            3MiB |
 |    1   N/A  N/A     53099      G   /usr/lib/firefox/firefox            3MiB |
 |    1   N/A  N/A     56293      G   /usr/lib/firefox/firefox            3MiB |
 |    1   N/A  N/A     58658      G   /usr/lib/firefox/firefox            3MiB |
 +-----------------------------------------------------------------------------+
 
 ***CPU***
 Architecture:                    x86_64
 CPU op-mode(s):                  32-bit, 64-bit
 Byte Order:                      Little Endian
 Address sizes:                   46 bits physical, 48 bits virtual
 CPU(s):                          12
 On-line CPU(s) list:             0-11
 Thread(s) per core:              2
 Core(s) per socket:              6
 Socket(s):                       1
 NUMA node(s):                    1
 Vendor ID:                       GenuineIntel
 CPU family:                      6
 Model:                           85
 Model name:                      Intel(R) Xeon(R) Gold 6128 CPU @ 3.40GHz
 Stepping:                        4
 CPU MHz:                         1200.000
 CPU max MHz:                     3700.0000
 CPU min MHz:                     1200.0000
 BogoMIPS:                        6800.00
 Virtualization:                  VT-x
 L1d cache:                       192 KiB
 L1i cache:                       192 KiB
 L2 cache:                        6 MiB
 L3 cache:                        19.3 MiB
 NUMA node0 CPU(s):               0-11
 Vulnerability Itlb multihit:     KVM: Vulnerable
 Vulnerability L1tf:              Mitigation; PTE Inversion
 Vulnerability Mds:               Mitigation; Clear CPU buffers; SMT vulnerable
 Vulnerability Meltdown:          Mitigation; PTI
 Vulnerability Spec store bypass: Mitigation; Speculative Store Bypass disabled via prctl and seccomp
 Vulnerability Spectre v1:        Mitigation; usercopy/swapgs barriers and __user pointer sanitization
 Vulnerability Spectre v2:        Mitigation; Full generic retpoline, IBPB conditional, IBRS_FW, STIBP conditional, RSB filling
 Vulnerability Srbds:             Not affected
 Vulnerability Tsx async abort:   Mitigation; Clear CPU buffers; SMT vulnerable
 Flags:                           fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx pdpe1gb rdtscp lm constant_tsc art arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc cpuid aperfmperf pni pclmulqdq dtes64 monitor ds_cpl vmx smx est tm2 ssse3 sdbg fma cx16 xtpr pdcm pcid dca sse4_1 sse4_2 x2apic movbe popcnt tsc_deadline_timer aes xsave avx f16c rdrand lahf_lm abm 3dnowprefetch cpuid_fault epb cat_l3 cdp_l3 invpcid_single pti intel_ppin ssbd mba ibrs ibpb stibp tpr_shadow vnmi flexpriority ept vpid ept_ad fsgsbase tsc_adjust bmi1 hle avx2 smep bmi2 erms invpcid rtm cqm mpx rdt_a avx512f avx512dq rdseed adx smap clflushopt clwb intel_pt avx512cd avx512bw avx512vl xsaveopt xsavec xgetbv1 xsaves cqm_llc cqm_occup_llc cqm_mbm_total cqm_mbm_local dtherm ida arat pln pts hwp hwp_act_window hwp_epp hwp_pkg_req pku ospke md_clear flush_l1d
 
 ***CMake***
 /home/pgali/anaconda3/envs/cudf_dev11/bin/cmake
 cmake version 3.18.2
 
 CMake suite maintained and supported by Kitware (kitware.com/cmake).
 
 ***g++***
 /usr/bin/g++
 g++ (Ubuntu 9.3.0-10ubuntu2) 9.3.0
 Copyright (C) 2019 Free Software Foundation, Inc.
 This is free software; see the source for copying conditions.  There is NO
 warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 
 
 ***nvcc***
 /usr/local/cuda/bin/nvcc
 nvcc: NVIDIA (R) Cuda compiler driver
 Copyright (c) 2005-2020 NVIDIA Corporation
 Built on Wed_Jul_22_19:09:09_PDT_2020
 Cuda compilation tools, release 11.0, V11.0.221
 Build cuda_11.0_bu.TC445_37.28845127_0
 
 ***Python***
 /home/pgali/anaconda3/envs/cudf_dev11/bin/python
 Python 3.7.8
 
 ***Environment Variables***
 PATH                            : /home/pgali/anaconda3/envs/cudf_dev11/bin:/home/pgali/anaconda3/condabin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin:/usr/local/cuda/bin
 LD_LIBRARY_PATH                 : :/usr/local/cuda/lib64:/usr/local/cuda/extras/CUPTI/lib64
 NUMBAPRO_NVVM                   :
 NUMBAPRO_LIBDEVICE              :
 CONDA_PREFIX                    : /home/pgali/anaconda3/envs/cudf_dev11
 PYTHON_PATH                     :
 
 ***conda packages***
 /home/pgali/anaconda3/condabin/conda
 # packages in environment at /home/pgali/anaconda3/envs/cudf_dev11:
 #
 # Name                    Version                   Build  Channel
 _libgcc_mutex             0.1                 conda_forge    conda-forge
 _openmp_mutex             4.5                       1_gnu    conda-forge
 abseil-cpp                20200225.2           he1b5a44_2    conda-forge
 alabaster                 0.7.12                     py_0    conda-forge
 appdirs                   1.4.3                      py_1    conda-forge
 argon2-cffi               20.1.0           py37h8f50634_1    conda-forge
 arrow-cpp                 0.17.1          py37h1234567_11_cuda    conda-forge
 arrow-cpp-proc            1.0.1                      cuda    conda-forge
 attrs                     20.1.0             pyh9f0ad1d_0    conda-forge
 aws-sdk-cpp               1.7.164              hba45d7a_2    conda-forge
 babel                     2.8.0                      py_0    conda-forge
 backcall                  0.2.0              pyh9f0ad1d_0    conda-forge
 backports                 1.0                        py_2    conda-forge
 backports.functools_lru_cache 1.6.1                      py_0    conda-forge
 black                     19.10b0                    py_4    conda-forge
 bleach                    3.1.5              pyh9f0ad1d_0    conda-forge
 bokeh                     2.2.1            py37hc8dfbb8_0    conda-forge
 boost-cpp                 1.72.0               h7b93d67_2    conda-forge
 brotli                    1.0.9                he1b5a44_0    conda-forge
 brotlipy                  0.7.0           py37h8f50634_1000    conda-forge
 bzip2                     1.0.8                h516909a_3    conda-forge
 c-ares                    1.16.1               h516909a_3    conda-forge
 ca-certificates           2020.6.20            hecda079_0    conda-forge
 certifi                   2020.6.20        py37hc8dfbb8_0    conda-forge
 cffi                      1.14.1           py37h2b28604_0    conda-forge
 cfgv                      3.2.0                      py_0    conda-forge
 chardet                   3.0.4           py37hc8dfbb8_1006    conda-forge
 clang                     8.0.1                hc9558a2_2    conda-forge
 clang-tools               8.0.1                hc9558a2_2    conda-forge
 clangxx                   8.0.1                         2    conda-forge
 click                     7.1.2              pyh9f0ad1d_0    conda-forge
 cloudpickle               1.6.0                      py_0    conda-forge
 cmake                     3.18.2               h5c55442_0    conda-forge
 cmake_setuptools          0.1.3                      py_0    rapidsai
 commonmark                0.9.1                      py_0    conda-forge
 cryptography              3.1              py37hb09aad4_0    conda-forge
 cudatoolkit               11.0.221             h6bb024c_0    nvidia
 cudf                      0.16.0a0+1482.g0a51abd7b2.dirty          pypi_0    pypi
 cudnn                     8.0.0                cuda11.0_0    nvidia
 cupy                      7.8.0            py37h0ce7dbb_0    rapidsai
 curl                      7.71.1               he644dc0_5    conda-forge
 cython                    0.29.21          py37h3340039_0    conda-forge
 cytoolz                   0.10.1           py37h516909a_0    conda-forge
 dask                      2.25.0+9.g377965ad          pypi_0    pypi
 dask-cudf                 0.16.0a0+1482.g0a51abd7b2.dirty          pypi_0    pypi
 decorator                 4.4.2                      py_0    conda-forge
 defusedxml                0.6.0                      py_0    conda-forge
 distlib                   0.3.1              pyh9f0ad1d_0    conda-forge
 distributed               2.25.0+6.g73fa9bd1          pypi_0    pypi
 dlpack                    0.3                  he1b5a44_1    conda-forge
 docutils                  0.16             py37hc8dfbb8_1    conda-forge
 double-conversion         3.1.5                he1b5a44_2    conda-forge
 editdistance              0.5.3            py37h3340039_1    conda-forge
 entrypoints               0.3             py37hc8dfbb8_1001    conda-forge
 expat                     2.2.9                he1b5a44_2    conda-forge
 fastavro                  1.0.0.post1      py37h8f50634_0    conda-forge
 fastrlock                 0.5              py37h3340039_0    conda-forge
 filelock                  3.0.12             pyh9f0ad1d_0    conda-forge
 flake8                    3.8.3                      py_1    conda-forge
 flatbuffers               1.12.0               he1b5a44_0    conda-forge
 freetype                  2.10.2               he06d7ca_0    conda-forge
 fsspec                    0.8.0                      py_0    conda-forge
 future                    0.18.2           py37hc8dfbb8_1    conda-forge
 gflags                    2.2.2             he1b5a44_1004    conda-forge
 glog                      0.4.0                h49b9bf7_3    conda-forge
 gmp                       6.2.0                he1b5a44_2    conda-forge
 grpc-cpp                  1.30.2               heedbac9_0    conda-forge
 heapdict                  1.0.1                      py_0    conda-forge
 hypothesis                5.28.0                     py_0    conda-forge
 icu                       67.1                 he1b5a44_0    conda-forge
 identify                  1.4.30             pyh9f0ad1d_0    conda-forge
 idna                      2.10               pyh9f0ad1d_0    conda-forge
 imagesize                 1.2.0                      py_0    conda-forge
 importlib-metadata        1.7.0            py37hc8dfbb8_0    conda-forge
 importlib_metadata        1.7.0                         0    conda-forge
 iniconfig                 1.0.1              pyh9f0ad1d_0    conda-forge
 ipykernel                 5.3.4            py37h43977f1_0    conda-forge
 ipython                   7.18.1           py37hc6149b9_0    conda-forge
 ipython_genutils          0.2.0                      py_1    conda-forge
 isort                     5.0.7            py37hc8dfbb8_0    conda-forge
 jedi                      0.17.2           py37hc8dfbb8_0    conda-forge
 jinja2                    2.11.2             pyh9f0ad1d_0    conda-forge
 jpeg                      9d                   h516909a_0    conda-forge
 jsonschema                3.2.0            py37hc8dfbb8_1    conda-forge
 jupyter_client            6.1.7                      py_0    conda-forge
 jupyter_core              4.6.3            py37hc8dfbb8_1    conda-forge
 krb5                      1.17.1               hfafb76e_3    conda-forge
 lcms2                     2.11                 hbd6801e_0    conda-forge
 ld_impl_linux-64          2.34                 hc38a660_9    conda-forge
 libblas                   3.8.0               17_openblas    conda-forge
 libcblas                  3.8.0               17_openblas    conda-forge
 libcurl                   7.71.1               hcdd3856_5    conda-forge
 libedit                   3.1.20191231         he28a2e2_2    conda-forge
 libev                     4.33                 h516909a_1    conda-forge
 libevent                  2.1.10               hcdb4288_2    conda-forge
 libffi                    3.2.1             he1b5a44_1007    conda-forge
 libgcc-ng                 9.3.0               h24d8f2e_16    conda-forge
 libgfortran-ng            7.5.0               hdf63c60_16    conda-forge
 libgomp                   9.3.0               h24d8f2e_16    conda-forge
 liblapack                 3.8.0               17_openblas    conda-forge
 libllvm10                 10.0.1               he513fc3_3    conda-forge
 libllvm8                  8.0.1                hc9558a2_0    conda-forge
 libnghttp2                1.41.0               h8cfc5f6_2    conda-forge
 libopenblas               0.3.10          pthreads_hb3c22a3_4    conda-forge
 libpng                    1.6.37               hed695b0_2    conda-forge
 libprotobuf               3.12.4               h8b12597_0    conda-forge
 librmm                    0.16.0a200904   cuda11.0_g83f7b35_284    rapidsai-nightly
 libsodium                 1.0.18               h516909a_0    conda-forge
 libssh2                   1.9.0                hab1572f_5    conda-forge
 libstdcxx-ng              9.3.0               hdf63c60_16    conda-forge
 libtiff                   4.1.0                hc7e4089_6    conda-forge
 libuv                     1.39.0               h516909a_0    conda-forge
 libwebp-base              1.1.0                h516909a_3    conda-forge
 llvmlite                  0.34.0           py37h5202443_1    conda-forge
 locket                    0.2.0                      py_2    conda-forge
 lz4-c                     1.9.2                he1b5a44_3    conda-forge
 markdown                  3.2.2                      py_0    conda-forge
 markupsafe                1.1.1            py37h8f50634_1    conda-forge
 mccabe                    0.6.1                      py_1    conda-forge
 mimesis                   4.0.0              pyh9f0ad1d_0    conda-forge
 mistune                   0.8.4           py37h8f50634_1001    conda-forge
 more-itertools            8.5.0                      py_0    conda-forge
 msgpack-python            1.0.0            py37h99015e2_1    conda-forge
 nbconvert                 5.6.1            py37hc8dfbb8_1    conda-forge
 nbformat                  5.0.7                      py_0    conda-forge
 nbsphinx                  0.7.1              pyh9f0ad1d_0    conda-forge
 nccl                      2.7.8.1              h4962215_0    nvidia
 ncurses                   6.2                  he1b5a44_1    conda-forge
 nodeenv                   1.5.0              pyh9f0ad1d_0    conda-forge
 notebook                  6.1.3            py37hc8dfbb8_0    conda-forge
 numba                     0.51.2           py37h9fdb41a_0    conda-forge
 numpy                     1.19.1           py37h7ea13bd_2    conda-forge
 numpydoc                  1.1.0              pyh9f0ad1d_0    conda-forge
 olefile                   0.46                       py_0    conda-forge
 openssl                   1.1.1g               h516909a_1    conda-forge
 packaging                 20.4               pyh9f0ad1d_0    conda-forge
 pandas                    1.1.1            py37h3340039_0    conda-forge
 pandoc                    1.19.2                        0    conda-forge
 pandocfilters             1.4.2                      py_1    conda-forge
 parquet-cpp               1.5.1                         2    conda-forge
 parso                     0.7.1              pyh9f0ad1d_0    conda-forge
 partd                     1.1.0                      py_0    conda-forge
 pathspec                  0.8.0              pyh9f0ad1d_0    conda-forge
 pexpect                   4.8.0            py37hc8dfbb8_1    conda-forge
 pickleshare               0.7.5           py37hc8dfbb8_1001    conda-forge
 pillow                    7.2.0            py37h718be6c_1    conda-forge
 pip                       20.2.2                     py_0    conda-forge
 pluggy                    0.13.1           py37hc8dfbb8_2    conda-forge
 pre-commit                2.7.1            py37hc8dfbb8_0    conda-forge
 pre_commit                2.7.1                         0    conda-forge
 prometheus_client         0.8.0              pyh9f0ad1d_0    conda-forge
 prompt-toolkit            3.0.7                      py_0    conda-forge
 psutil                    5.7.2            py37h8f50634_0    conda-forge
 ptyprocess                0.6.0                   py_1001    conda-forge
 py                        1.9.0              pyh9f0ad1d_0    conda-forge
 pyarrow                   0.17.1          py37h1234567_11_cuda    conda-forge
 pycodestyle               2.6.0              pyh9f0ad1d_0    conda-forge
 pycparser                 2.20               pyh9f0ad1d_2    conda-forge
 pyflakes                  2.2.0              pyh9f0ad1d_0    conda-forge
 pygments                  2.6.1                      py_0    conda-forge
 pyopenssl                 19.1.0                     py_1    conda-forge
 pyparsing                 2.4.7              pyh9f0ad1d_0    conda-forge
 pyrsistent                0.16.0           py37h8f50634_0    conda-forge
 pysocks                   1.7.1            py37hc8dfbb8_1    conda-forge
 pytest                    6.0.1            py37hc8dfbb8_0    conda-forge
 python                    3.7.8           h6f2ec95_1_cpython    conda-forge
 python-dateutil           2.8.1                      py_0    conda-forge
 python_abi                3.7                     1_cp37m    conda-forge
 pytz                      2020.1             pyh9f0ad1d_0    conda-forge
 pyyaml                    5.3.1            py37h8f50634_0    conda-forge
 pyzmq                     19.0.2           py37hac76be4_0    conda-forge
 rapidjson                 1.1.0             he1b5a44_1002    conda-forge
 re2                       2020.07.06           he1b5a44_1    conda-forge
 readline                  8.0                  he28a2e2_2    conda-forge
 recommonmark              0.6.0                      py_0    conda-forge
 regex                     2020.7.14        py37h8f50634_0    conda-forge
 requests                  2.24.0             pyh9f0ad1d_0    conda-forge
 rhash                     1.3.6             h14c3975_1001    conda-forge
 rmm                       0.16.0a200904   cuda_11.0_py37_g83f7b35_284    rapidsai-nightly
 send2trash                1.5.0                      py_0    conda-forge
 setuptools                49.6.0           py37hc8dfbb8_0    conda-forge
 six                       1.15.0             pyh9f0ad1d_0    conda-forge
 snappy                    1.1.8                he1b5a44_3    conda-forge
 snowballstemmer           2.0.0                      py_0    conda-forge
 sortedcontainers          2.2.2              pyh9f0ad1d_0    conda-forge
 spdlog                    1.8.0                hc9558a2_0    conda-forge
 sphinx                    3.2.1                      py_0    conda-forge
 sphinx-copybutton         0.3.0              pyh9f0ad1d_0    conda-forge
 sphinx-markdown-tables    0.0.14             pyh9f0ad1d_1    conda-forge
 sphinx_rtd_theme          0.5.0              pyh9f0ad1d_0    conda-forge
 sphinxcontrib-applehelp   1.0.2                      py_0    conda-forge
 sphinxcontrib-devhelp     1.0.2                      py_0    conda-forge
 sphinxcontrib-htmlhelp    1.0.3                      py_0    conda-forge
 sphinxcontrib-jsmath      1.0.1                      py_0    conda-forge
 sphinxcontrib-qthelp      1.0.3                      py_0    conda-forge
 sphinxcontrib-serializinghtml 1.1.4                      py_0    conda-forge
 sphinxcontrib-websupport  1.2.4              pyh9f0ad1d_0    conda-forge
 sqlite                    3.33.0               h4cf870e_0    conda-forge
 streamz                   0.5.5                    pypi_0    pypi
 tblib                     1.6.0                      py_0    conda-forge
 terminado                 0.8.3            py37hc8dfbb8_1    conda-forge
 testpath                  0.4.4                      py_0    conda-forge
 thrift-cpp                0.13.0               h62aa4f2_3    conda-forge
 tk                        8.6.10               hed695b0_0    conda-forge
 toml                      0.10.1             pyh9f0ad1d_0    conda-forge
 toolz                     0.10.0                     py_0    conda-forge
 tornado                   6.0.4            py37h8f50634_1    conda-forge
 traitlets                 5.0.3                      py_0    conda-forge
 typed-ast                 1.4.1            py37h516909a_0    conda-forge
 typing_extensions         3.7.4.2                    py_0    conda-forge
 urllib3                   1.25.10                    py_0    conda-forge
 virtualenv                20.0.20          py37hc8dfbb8_1    conda-forge
 wcwidth                   0.2.5              pyh9f0ad1d_1    conda-forge
 webencodings              0.5.1                      py_1    conda-forge
 wheel                     0.35.1             pyh9f0ad1d_0    conda-forge
 xz                        5.2.5                h516909a_1    conda-forge
 yaml                      0.2.5                h516909a_0    conda-forge
 zeromq                    4.3.2                he1b5a44_3    conda-forge
 zict                      2.0.0                      py_0    conda-forge
 zipp                      3.1.0                      py_0    conda-forge
 zlib                      1.2.11            h516909a_1009    conda-forge
 zstd                      1.4.5                h6597ccf_2    conda-forge

Additional context
Surfaced while running fuzz tests #6001
@galipremsagar galipremsagar added bug Something isn't working Needs Triage Need team to review and classify cuIO cuIO issue labels Sep 8, 2020
@kkraus14 kkraus14 added Python Affects Python cuDF API. libcudf Affects libcudf (C++/CUDA) code. and removed Needs Triage Need team to review and classify labels Sep 15, 2020
@kkraus14
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I don't think we want to infer the type to string in this situation (our equivalent of object for now). We could really use an empty or null type in this case.

@nvdbaranec nvdbaranec mentioned this issue Sep 25, 2020
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@karthikeyann
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karthikeyann commented Sep 25, 2020 •
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is it possible NOW to create all-null column with empty type in cudf?

@kkraus14
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is it possible NOW to create all-null column with empty type in cudf?

No, we currently don't have a concept of a Null or Empty column in cudf Python currently, but this is something we could plumb in if libcudf supported it.

@karthikeyann karthikeyann mentioned this issue Nov 19, 2020
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kkraus14 pushed a commit that referenced this issue Nov 24, 2020
@karthikeyann
Add LogicalType to Parquet reader (#6511)
632ac54 
closes #5831 
closes #6168
cudf.read_parquet to support for read column of type string that is full of nulls.
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bug Something isn't working cuIO cuIO issue libcudf Affects libcudf (C++/CUDA) code. Python Affects Python cuDF API.
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[REVIEW] Add LogicalType to Parquet reader karthikeyann/cudf
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@kkraus14 @karthikeyann @galipremsagar