[BugFix] Fix FunctionParams NPE

[banmoy]

Why I'm doing:

In stream load columns header, using now() to set column value throws the following NPE

java.lang.NullPointerException: Cannot invoke "java.util.List.stream()" because "exprs" is null
        at com.starrocks.analysis.FunctionParams.<init>(FunctionParams.java:64) ~[starrocks-fe.jar:?]
        at com.starrocks.analysis.FunctionParams.<init>(FunctionParams.java:86) ~[starrocks-fe.jar:?]
        at com.starrocks.load.Load.transformHadoopFunctionExpr(Load.java:1059) ~[starrocks-fe.jar:?]
        at com.starrocks.load.Load.initColumns(Load.java:526) ~[starrocks-fe.jar:?]
        at com.starrocks.planner.StreamLoadScanNode.initColumns(StreamLoadScanNode.java:258) ~[starrocks-fe.jar:?]
        at com.starrocks.planner.StreamLoadScanNode.initParams(StreamLoadScanNode.java:252) ~[starrocks-fe.jar:?]
        at com.starrocks.planner.StreamLoadScanNode.init(StreamLoadScanNode.java:207) ~[starrocks-fe.jar:?]
        at com.starrocks.planner.StreamLoadPlanner.plan(StreamLoadPlanner.java:194) ~[starrocks-fe.jar:?]
        at com.starrocks.service.FrontendServiceImpl.streamLoadPutImpl(FrontendServiceImpl.java:1739) ~[starrocks-fe.jar:?]
        at com.starrocks.service.FrontendServiceImpl.streamLoadPut(FrontendServiceImpl.java:1676) ~[starrocks-fe.jar:?]
        at com.starrocks.thrift.FrontendService$Processor$streamLoadPut.getResult(FrontendService.java:5785) ~[starrocks-fe.jar:?]
        at com.starrocks.thrift.FrontendService$Processor$streamLoadPut.getResult(FrontendService.java:5762) ~[starrocks-fe.jar:?]
        at org.apache.thrift.ProcessFunction.process(ProcessFunction.java:40) ~[libthrift-0.20.0.jar:0.20.0]
        at org.apache.thrift.TBaseProcessor.process(TBaseProcessor.java:40) ~[libthrift-0.20.0.jar:0.20.0]
        at com.starrocks.common.SRTThreadPoolServer$WorkerProcess.run(SRTThreadPoolServer.java:311) ~[starrocks-fe.jar:?]
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136) ~[?:?]
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635) ~[?:?]
        at java.lang.Thread.run(Thread.java:840) ~[?:?]

Reproduce

CREATE TABLE `test_npe` (
   `channel_type` int(11) NOT NULL,
   `create_time` datetime NOT NULL DEFAULT CURRENT_TIMESTAMP
 ) ENGINE=OLAP
 PROPERTIES (
    "replication_num" = "1"
 );

curl --location-trusted -u root: \
    -H "Expect:100-continue"  \
    -H "columns:channel_type,create_time=now()" \
    -d "1" \
    -XPUT http://127.0.0.1:8030/api/test/test_npe/_stream_load

What I'm doing:

Introduced by #36596 since 3.3. Should check the null arguments in FunctionParams constructor

Fixes #issue

What type of PR is this:

• BugFix
• Feature
• Enhancement
• Refactor
• UT
• Doc
• Tool

Does this PR entail a change in behavior?

• Yes, this PR will result in a change in behavior.
• No, this PR will not result in a change in behavior.

If yes, please specify the type of change:

• Interface/UI changes: syntax, type conversion, expression evaluation, display information
• Parameter changes: default values, similar parameters but with different default values
• Policy changes: use new policy to replace old one, functionality automatically enabled
• Feature removed
• Miscellaneous: upgrade & downgrade compatibility, etc.

Checklist:

• I have added test cases for my bug fix or my new feature
• This pr needs user documentation (for new or modified features or behaviors)
  • I have added documentation for my new feature or new function
• This is a backport pr

Bugfix cherry-pick branch check:

• I have checked the version labels which the pr will be auto-backported to the target branch
  • 3.4
  • 3.3
  • 3.2
  • 3.1
  • 3.0

[CLAassistant]

All committers have signed the CLA.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[github-actions]

[Java-Extensions Incremental Coverage Report]

✅ pass : 0 / 0 (0%)

[github-actions]

[BE Incremental Coverage Report]

✅ pass : 0 / 0 (0%)

[github-actions]

[FE Incremental Coverage Report]

✅ pass : 1 / 1 (100.00%)

file detail

	path	covered_line	new_line	coverage	not_covered_line_detail
🔵	com/starrocks/analysis/FunctionParams.java	1	1	100.00%	[]