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https://issues.apache.org/jira/browse/HIVE-25557?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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katty he updated HIVE-25557:
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Affects Version/s: 3.1.2
Environment: Tez *0.10.1* (was: Hive 3.1.2
Tez *0.10.1*)
> Hive 3.1.2 with Tez is slow to clount data in parquet format
> ------------------------------------------------------------
>
> Key: HIVE-25557
> URL: https://issues.apache.org/jira/browse/HIVE-25557
> Project: Hive
> Issue Type: Improvement
> Affects Versions: 3.1.2
> Environment: Tez *0.10.1*
> Reporter: katty he
> Priority: Major
>
> recently, i use test a sql like seelct count(*) from table in Hive 3.1.2 with
> Tez, and the table is in parquet format, normally, when counting, the query
> engin can read metadata instead of reading the full data, but in my case,
> Tez can not get count by metadata only, it will read the data, so it's slow,
> when count 2 billion data, tez wil use 500s , and spend 60s to initialized,
> ts that a problem?
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