Created
February 8, 2021 10:12
-
-
Save klesouza/3173549aeca4acb205dda770c6213269 to your computer and use it in GitHub Desktop.
Calculating total compressed size of a parquet column
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| import pyarrow.parquet | |
| def calculate_column_size(column, file): | |
| m = pyarrow.parquet.read_metadata(file) | |
| sz = sum([c["total_compressed_size"] for x in m.to_dict()["row_groups"] for c in x["columns"] if c["path_in_schema"].startswith(column)]) | |
| totalsize = sum([c["total_compressed_size"] for x in m.to_dict()["row_groups"] for c in x["columns"]]) | |
| return sz, sz/totalsize |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment