[BugFix] Fix NullPointerException in mv update meta for iceberg catalog

[LiShuMing]

Why I'm doing:

ERROR_MESSAGE: Refresh materialized view dwd_cf_infe_tplcore_t_product_fee_a_min failed after retrying 1 times(try-lock 0 times), error-msg : java.lang.NullPointerException
	at com.starrocks.connector.iceberg.IcebergMetadata.getPartitions(IcebergMetadata.java:332)
	at com.starrocks.server.MetadataMgr.getPartitions(MetadataMgr.java:390)
	at com.starrocks.scheduler.PartitionBasedMvRefreshProcessor.getSelectedPartitionInfos(PartitionBasedMvRefreshProcessor.java:1747)
	at com.starrocks.scheduler.PartitionBasedMvRefreshProcessor.getSelectedPartitionInfosOfExternalTable(PartitionBasedMvRefreshProcessor.java:1725)
	at com.starrocks.scheduler.PartitionBasedMvRefreshProcessor.updateMeta(PartitionBasedMvRefreshProcessor.java:638)
	at com.starrocks.scheduler.PartitionBasedMvRefreshProcessor.doRefreshMaterializedView(PartitionBasedMvRefreshProcessor.java:377)
	at com.starrocks.scheduler.PartitionBasedMvRefreshProcessor.doRefreshMaterializedViewWithRetry(PartitionBasedMvRefreshProcessor.java:304)
	at com.starrocks.scheduler.PartitionBasedMvRefreshProcessor.doMvRefresh(PartitionBasedMvRefreshProcessor.java:255)
	at com.starrocks.scheduler.PartitionBasedMvRefreshProcessor.processTaskRun(PartitionBasedMvRefreshProcessor.java:194)
	at com.starrocks.scheduler.TaskRun.executeTaskRun(TaskRun.java:216)
	at com.starrocks.scheduler.TaskRunExecutor.lambda$executeTaskRun$0(TaskRunExecutor.java:53)
	at java.util.concurrent.CompletableFuture$AsyncSupply.run(CompletableFuture.java:1604)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at java.lang.Thread.run(Thread.java:750)

What I'm doing:

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
  • 3.3
  • 3.2
  • 3.1
  • 3.0
  • 2.5

[sonarqubecloud]

Quality Gate failed

Failed conditions
B Maintainability Rating on New Code (required ≥ A)

See analysis details on SonarCloud

Catch issues before they fail your Quality Gate with our IDE extension SonarLint

[github-actions]

[FE Incremental Coverage Report]

❌ fail : 3 / 6 (50.00%)

file detail

	path	covered_line	new_line	coverage	not_covered_line_detail
🔵	com/starrocks/connector/iceberg/IcebergMetadata.java	3	6	50.00%	[389, 390, 391]

[github-actions]

[BE Incremental Coverage Report]

✅ pass : 0 / 0 (0%)

[github-actions]

@Mergifyio backport branch-3.3

[github-actions]

@Mergifyio backport branch-3.2

[github-actions]

@Mergifyio backport branch-3.1

[mergify]

backport branch-3.3

✅ Backports have been created

• #46395 [BugFix] Fix NullPointerException in mv update meta for iceberg catalog (backport #46155) has been created for branch branch-3.3

[mergify]

backport branch-3.2

✅ Backports have been created

• #46397 [BugFix] Fix NullPointerException in mv update meta for iceberg catalog (backport #46155) has been created for branch branch-3.2

[mergify]

backport branch-3.1

✅ Backports have been created

• #46398 [BugFix] Fix NullPointerException in mv update meta for iceberg catalog (backport #46155) has been created for branch branch-3.1