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Cast is very slow in arrow/arrow2 #1302

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sundy-li opened this issue Aug 5, 2021 · 0 comments

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C-feature C-performance

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sundy-li commented Aug 5, 2021 •

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Summary

SELECT sum(number)
FROM numbers_mt(10000000000)

1 rows in set. Elapsed: 0.522 sec. Processed 10.00 billion rows, 80.14 GB (19.16 billion rows/s., 153.54 GB/s.)

SELECT sum(CAST(number, 'UInt32'))
FROM numbers_mt(10000000000)

1 rows in set. Elapsed: 36.359 sec. Processed 10.00 billion rows, 80.14 GB (275.03 million rows/s., 2.20 GB/s.)

jorgecarleitao/arrow2#252

The second query is 70 times slower

The text was updated successfully, but these errors were encountered:

sundy-li added C-feature C-performance labels

sundy-li closed this as completed

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