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ARROW-375: Fix unicode Python 3 issue in columns argument of parquet.read_table #204

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ARROW-375: Fix unicode Python 3 issue in columns argument of parquet.read_table #204

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12 changes: 8 additions & 4 deletions python/pyarrow/parquet.pyx
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Original file line number Diff line number Diff line change
Expand Up @@ -93,23 +93,27 @@ cdef class ParquetReader:
Integer index of the position of the column
"""
cdef:
const FileMetaData* metadata = self.reader.get().parquet_reader().metadata()
const FileMetaData* metadata = (self.reader.get()
.parquet_reader().metadata())
int i = 0

if self.column_idx_map is None:
self.column_idx_map = {}
for i in range(0, metadata.num_columns()):
self.column_idx_map[str(metadata.schema().Column(i).path().get().ToDotString())] = i
col_bytes = tobytes(metadata.schema().Column(i)
.path().get().ToDotString())
self.column_idx_map[col_bytes] = i

return self.column_idx_map[column_name]
return self.column_idx_map[tobytes(column_name)]

def read_column(self, int column_index):
cdef:
Array array = Array()
shared_ptr[CArray] carray

with nogil:
check_status(self.reader.get().ReadFlatColumn(column_index, &carray))
check_status(self.reader.get()
.ReadFlatColumn(column_index, &carray))

array.init(carray)
return array
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