Dear,
I continue my learning with arrow.
1/ I would like to know if it is more efficient to store string as fxed
binary size ?
example:
---------------------------------------------------------------------
from pyarrow import Schema, Table, binary, schema, array
def to_binaries( s: str, size: int = 50) -> bytes:
nullchar = size - len(s)
if nullchar < 0:
raise Exception(f'String has more than {size} character:
{s}')
b = s.encode('ascii') + b'\0' * nullchar
return b
fields = [('ID', binary(50))]
sc = schema(fields)
d = [ 'test', 'ab', 'bc', 'cd' ]
db = array([ to_binaries(x) for x in d ], type=binary(50))
t = Table.from_arrays(arrays=[db], schema=sc)
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2/ I misunderstood the part of Writing and Reading Streams
\_
https://arrow.apache.org/docs/python/ipc.html#writing-and-reading-streams
I we use the provided writer, the final file format it is parquet file
?
Thanks
best regards
