[Enhancement] Optimize broker load small orc files

[Smith-Cruise]

Why I'm doing:

If orc file's size is small, we can use one io request to load it

What I'm doing:

Support it

Fix https://github.com/StarRocks/StarRocksTest/issues/6250

What type of PR is this:

• [ ] BugFix
• [ ] Feature
• [x] Enhancement
• [ ] Refactor
• [ ] UT
• [ ] Doc
• [ ] Tool

Does this PR entail a change in behavior?

• [ ] Yes, this PR will result in a change in behavior.
• [x] 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:

• [x] I have checked the version labels which the pr will be auto-backported to the target branch
  • [x] 3.2
  • [x] 3.1
  • [x] 3.0
  • [ ] 2.5

[github-actions[bot]]

[FE Incremental Coverage Report]

:white_check_mark: pass : 0 / 0 (0%)

[github-actions[bot]]

[BE Incremental Coverage Report]

:white_check_mark: pass : 14 / 16 (87.50%)

file detail

	path	covered_line	new_line	coverage	not_covered_line_detail
:large_blue_circle:	be/src/exec/orc_scanner.cpp	14	16	87.50%	[202, 204]

[github-actions[bot]]

@Mergifyio backport branch-3.2

[mergify[bot]]

backport branch-3.2

✅ Backports have been created

• #41856 [Enhancement] Optimize broker load small orc files (backport #41765) has been created for branch branch-3.2

[jaogoy]

@Smith-Cruise How about other file format, like Parquet, CSV? Is the 8MB tested?

[Smith-Cruise]

@Smith-Cruise How about other file format, like Parquet, CSV? Is the 8MB tested?

Only optimized for ORC.

CSV we don't need to optimize, because our minimal io request size is 8MB, it's big enough.