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RubyでcsvファイルをParquet形式に変換

Last updated at Posted at 2023-06-14

PythonでcsvファイルをParquet形式に変換という記事を見て、Rubyでもできるやんけと思ってメモ。

たぶん一番簡単なのはPolarsを使う方法。

require "polars"

df = Polars.read("foo.csv")
df.write_parquet("foo.parquet")

簡単ですね。RedArrowを使う場合は、

require "arrow"
require "parquet"

tb = Arrow::Table.load("foo.csv")
tb.save("foo.parquet")

ですね。この記事は以上です。

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