katty he created HIVE-25557:
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Summary: 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
Environment: Hive 3.1.2
Tez *0.10.1*
Reporter: katty he
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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