Marcelo Vanzin commented on SPARK-23486:

I removed the target versions since the PR seems stalled in review.

> 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
>              Labels: starter
> For a query invoking the same function multiple times, the current 
> {{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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