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@aimainn

Parquetとは

Last updated at Posted at 2022-04-12

1. CSVとParquetの比較

CSV Parquet
指向 行 列
利点 非関連列をスキップできるため、クエリの読込や集計を効率化できる

2. 実装

# 入出力ファイル指定
in_file = "xxx.parquet"
out_file = "yyy.parquet"

# 実行
df = pd.read_parquet(in_file)
df.to_parquet(out_file)
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