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https://issues.apache.org/jira/browse/HIVE-21563?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16808002#comment-16808002
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Sergey Shelukhin commented on HIVE-21563:
-----------------------------------------
Hmm.. what are the side effects of this behavior? It looks like it would affect
other methods.
> Improve Table#getEmptyTable performance by disable registerAllFunctionsOnce
> ---------------------------------------------------------------------------
>
> Key: HIVE-21563
> URL: https://issues.apache.org/jira/browse/HIVE-21563
> Project: Hive
> Issue Type: Improvement
> Reporter: Yuming Wang
> Assignee: Yuming Wang
> Priority: Major
> Attachments: HIVE-21563.001.patch
>
>
> We do not need registerAllFunctionsOnce when {{Table#getEmptyTable}}. The
> stack trace:
> {noformat}
> at
> org.apache.hadoop.hive.ql.exec.Registry.registerGenericUDF(Registry.java:177)
> at
> org.apache.hadoop.hive.ql.exec.Registry.registerGenericUDF(Registry.java:170)
> at
> org.apache.hadoop.hive.ql.exec.FunctionRegistry.<clinit>(FunctionRegistry.java:209)
> at org.apache.hadoop.hive.ql.metadata.Hive.reloadFunctions(Hive.java:247)
> at
> org.apache.hadoop.hive.ql.metadata.Hive.registerAllFunctionsOnce(Hive.java:231)
> at org.apache.hadoop.hive.ql.metadata.Hive.<init>(Hive.java:388)
> at org.apache.hadoop.hive.ql.metadata.Hive.create(Hive.java:332)
> at org.apache.hadoop.hive.ql.metadata.Hive.getInternal(Hive.java:312)
> at org.apache.hadoop.hive.ql.metadata.Hive.get(Hive.java:288)
> at
> org.apache.hadoop.hive.ql.session.SessionState.setAuthorizerV2Config(SessionState.java:913)
> at
> org.apache.hadoop.hive.ql.session.SessionState.setupAuth(SessionState.java:877)
> at
> org.apache.hadoop.hive.ql.session.SessionState.getAuthenticator(SessionState.java:1479)
> at
> org.apache.hadoop.hive.ql.session.SessionState.getUserFromAuthenticator(SessionState.java:1150)
> at org.apache.hadoop.hive.ql.metadata.Table.getEmptyTable(Table.java:180)
> {noformat}
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