cudf: [BUG] Read_parquet not working with spark timestamp type in parquet file

Describe the bug Reading a parquet file results in error.

Steps/Code to reproduce bug

import cudf
cudf.io.read_parquet('/path/to/file.snappy.parquet')

Output:

RuntimeError                              Traceback (most recent call last)
/conda/envs/rapids/lib/python3.7/site-packages/cudf-0.7.0.dev0+834.g3985c79.dirty-py3.7-linux-x86_64.egg/cudf/io/parquet.py in read_parquet(path, engine, columns, *args, **kwargs)
     17         df = cpp_read_parquet(
     18             path,
---> 19             columns
     20         )
     21     else:

cudf/bindings/parquet.pyx in cudf.bindings.parquet.cpp_read_parquet()

cudf/bindings/parquet.pyx in cudf.bindings.parquet.cpp_read_parquet()

RuntimeError: Invalid gdf_dtype in type_dispatcher

Also when trying to read a non existent file:

import cudf
cudf.io.read_parquet('/path/to/nonexistent/file')

Output

/conda/envs/rapids/lib/python3.7/site-packages/cudf-0.7.0.dev0+834.g3985c79.dirty-py3.7-linux-x86_64.egg/cudf/io/parquet.py in read_parquet(path, engine, columns, *args, **kwargs)
     17         df = cpp_read_parquet(
     18             path,
---> 19             columns
     20         )
     21     else:

cudf/bindings/parquet.pyx in cudf.bindings.parquet.cpp_read_parquet()

cudf/bindings/parquet.pyx in cudf.bindings.parquet.cpp_read_parquet()

NameError: name 'errno' is not defined

Expected behavior File gets read if valid. If filename is invalid, the proper error gets propagated. Environment details (please complete the following information):

• Method of cuDF install: From source