def hash_columns(columns, result):
"""Hash the *columns* and store in *result*.
Returns *result*
"""
assert len(columns) > 0
assert result.dtype == np.int32
# No-op for 0-sized
if len(result) == 0:
return result
col_input = [col.cffi_view for col in columns]
col_out = result.cffi_view
ncols = len(col_input)
hashfn = libgdf.GDF_HASH_MURMUR3
libgdf.gdf_hash(ncols, col_input, hashfn, col_out)
return result
def hash_columns(columns, result, initial_hash_values=None):
"""Hash the *columns* and store in *result*.
Returns *result*
"""
assert len(columns) > 0
assert result.dtype == np.int32
# No-op for 0-sized
if len(result) == 0:
return result
col_input = [col.cffi_view for col in columns]
col_out = result.cffi_view
ncols = len(col_input)
hashfn = libgdf.GDF_HASH_MURMUR3
if initial_hash_values is None:
initial_hash_values = ffi.NULL
else:
initial_hash_values = unwrap_devary(initial_hash_values)
libgdf.gdf_hash(ncols, col_input, hashfn, initial_hash_values, col_out)
return result
