Yuming Wang created HIVE-21563:
----------------------------------
Summary: 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
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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