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#!/usr/bin/env python3
########################################################################
#
# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, You can obtain one at http://mozilla.org/MPL/2.0/.
#
########################################################################
import argparse
from pathlib import Path
import pyarrow.parquet as pq
def main():
parser = argparse.ArgumentParser()
parser.add_argument("path", type=Path)
parser.add_argument("--num", "-n", type=int, default=10, help="Number of rows to print.")
args = parser.parse_args()
parquet = pq.ParquetFile(args.path)
print(f"num-row-groups: {parquet.metadata.num_row_groups}")
print(f"num-rows: {parquet.metadata.num_rows}")
print(f"num-columns: {parquet.metadata.num_columns}")
print("schema:")
for i, name in enumerate(parquet.metadata.schema.names):
col = parquet.metadata.schema.column(i)
print(f" column {i}:")
for attr_name in dir(col):
if attr_name.startswith("_"):
continue
attr_value = getattr(col, attr_name)
if callable(attr_value):
continue
print(f" {attr_name}: {attr_value}")
for icol, (name, chunked_array) in enumerate(zip(parquet.metadata.schema.names, parquet.read_row_group(0))):
print(f"column {icol}:")
print(f" name: {name}")
print(f" type: {chunked_array.type}")
print(f" num-chunks: {chunked_array.num_chunks}")
print(f" data:")
for i, v in enumerate(chunked_array.chunks[0]):
if i == args.num:
break
print(f" - {v}")
if __name__ == "__main__":
main()
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