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import os |
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import click |
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import polars as pl |
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@click.command() |
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@click.option( |
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"--src_dir", |
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type=click.Path(exists=True, file_okay=False), |
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required=True, |
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help="Path to the directory containing source Parquet files, e.g., './50m'.", |
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) |
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@click.option( |
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"--dst_dir", |
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type=click.Path(file_okay=False), |
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required=False, |
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help="Path to the directory where Parquet files will be saved. " |
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"If not specified, Parquet files are saved in 'src_dir' with prefix 'seq_'.", |
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) |
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@click.option( |
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"--files", |
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type=str, |
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multiple=True, |
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help="List of parquet filenames to convert. If not specified, all Parquet files in 'src_dir' will be converted. " |
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"For example, '--files dislike.parquet --files like.parquet'.", |
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) |
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@click.option( |
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"--aggregation", |
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type=click.Choice(["structs", "columns"]), |
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required=True, |
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help="Agg method: 'structs' for a sequence of structs per 'uid', 'columns' for individual column aggregation.", |
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) |
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def cli(src_dir: str, dst_dir: str, files: list[str], aggregation: str): |
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transform2sequential(src_dir, dst_dir, files, aggregation) |
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def transform2sequential(src_dir: str, dst_dir: str, files: list[str], aggregation: str): |
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for file in files: |
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print(f"Processing file: {file}") |
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src_path = os.path.join(src_dir, file) |
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parquet_path = os.path.join(dst_dir, file) |
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if os.path.exists(parquet_path): |
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parquet_path = os.path.join(dst_dir, f"{aggregation}_" + file) |
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assert not os.path.exists(parquet_path) |
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os.makedirs(dst_dir, exist_ok=True) |
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df = pl.scan_parquet(src_path) |
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if aggregation == "structs": |
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seq_df = ( |
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df.select("uid", pl.struct(pl.all().exclude("uid")).alias("events")) |
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.group_by("uid", maintain_order=True) |
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.agg(pl.col("events")) |
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) |
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seq_df.sink_parquet( |
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parquet_path, |
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compression="lz4", |
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statistics=True, |
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) |
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elif aggregation == "columns": |
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col_agg_df = df.group_by("uid", maintain_order=True).agg(pl.all().exclude("uid")) |
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col_agg_df.sink_parquet( |
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parquet_path, |
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compression="lz4", |
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statistics=True, |
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) |
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if __name__ == "__main__": |
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cli() |
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