wangyum opened a new pull request #2251:
URL: https://github.com/apache/hive/pull/2251
### What changes were proposed in this pull request?
Improve `Table#getEmptyTable` performance by disabling
`registerAllFunctionsOnce`.
### Why are the changes needed?
`Table#getEmptyTable` do not need `registerAllFunctionsOnce` . The stack
trace:
```java
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)
```
### Does this PR introduce _any_ user-facing change?
No.
### How was this patch tested?
Existing test.
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