[
https://issues.apache.org/jira/browse/SPARK-20318?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Apache Spark reassigned SPARK-20318:
------------------------------------
Assignee: (was: Apache Spark)
> Use Catalyst type for min/max in ColumnStat for ease of estimation
> ------------------------------------------------------------------
>
> Key: SPARK-20318
> URL: https://issues.apache.org/jira/browse/SPARK-20318
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Affects Versions: 2.2.0
> Reporter: Zhenhua Wang
>
> Currently when estimating predicates like col > literal or col = literal, we
> will update min or max in column stats based on literal value. However,
> literal value is of Catalyst type (internal type), while min/max is of
> external type. This causes unnecessary conversion when comparing them and
> updating column stats.
> To solve this, we can use Catalyst type for min/max in ColumnStat for ease of
> estimation. Note that the persistent form in metastore is still of external
> type, so there's no inconsistency for statistics in metastore.
--
This message was sent by Atlassian JIRA
(v6.3.15#6346)
---------------------------------------------------------------------
To unsubscribe, e-mail: [email protected]
For additional commands, e-mail: [email protected]
