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https://issues.apache.org/jira/browse/SPARK-23486?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16372285#comment-16372285
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Cheng Lian commented on SPARK-23486:
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Please refer to [this
comment|https://issues.apache.org/jira/browse/SPARK-19737?focusedCommentId=16371377&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-16371377]
for more details.
> LookupFunctions should not check the same function name more than once
> ----------------------------------------------------------------------
>
> Key: SPARK-23486
> URL: https://issues.apache.org/jira/browse/SPARK-23486
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 2.2.1, 2.3.0
> Reporter: Cheng Lian
> Priority: Major
>
> For a query invoking the same function multiple times, the currentÂ
> {{LookupFunctions}} rule performs a check for each invocation. For users
> using Hive metastore as external catalog, this issues unnecessary metastore
> accesses and can slow down the analysis phase quite a bit.
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