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From sreeparna bhabani <bhabani.sreepa...@gmail.com>
Subject Suggestion needed for UNION ALL performance in Apache drill
Date Wed, 22 Apr 2020 18:31:05 GMT
Hi Team,

I reach out to you for a specific problem regarding UNION ALL. There is one
UNION ALL statement which combines 2 queries. The individual queries are
taking 8 secs and 1 sec respectively. But UNION ALL takes 30 secs.
PARQUET_SCAN_ROW_GROUP takes the maximum time. Apache drill version is 1.17.

Please help to suggest how to improve this UNION ALL performance. We are
using parquet file.

Thanks,
Sreeparna Bhabani

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