refactor(batch): Make local mode default

[liurenjie1024]

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What's changed and what's your intention?

Make local execution mode default.

Checklist

• I have written necessary rustdoc comments
• I have added necessary unit tests and integration tests
• All checks passed in ./risedev check (or alias, ./risedev c)

Documentation

If your pull request contains user-facing changes, please specify the types of the changes, and create a release note. Otherwise, please feel free to remove this section.

Types of user-facing changes

Please keep the types that apply to your changes, and remove those that do not apply.

• RisingWave cluster configuration changes

Release note

Default batch execution mode changed from distributed to local.

Refer to a related PR or issue link (optional)

#4654

[codecov]

Codecov Report

Merging #4789 (400a254) into main (0019e59) will decrease coverage by 0.10%.
The diff coverage is 54.25%.

@@            Coverage Diff             @@
##             main    #4789      +/-   ##
==========================================
- Coverage   73.94%   73.83%   -0.11%     
==========================================
  Files         871      871              
  Lines      131548   131846     +298     
==========================================
+ Hits        97267    97346      +79     
- Misses      34281    34500     +219     

Flag	Coverage Δ
rust	73.83% <54.25%> (-0.11%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/batch/src/executor/join/lookup_join.rs	56.06% <0.00%> (-0.70%)	⬇️
src/batch/src/task/task_execution.rs	58.46% <ø> (ø)
src/common/src/catalog/mod.rs	70.00% <0.00%> (-2.42%)	⬇️
src/common/src/config.rs	54.01% <ø> (ø)
src/common/src/error.rs	70.53% <ø> (ø)
src/common/src/session_config/query_mode.rs	84.84% <ø> (ø)
src/compute/src/rpc/service/stream_service.rs	0.00% <0.00%> (ø)
src/compute/src/server.rs	0.00% <0.00%> (ø)
src/connector/src/source/pulsar/source/reader.rs	0.00% <0.00%> (ø)
src/meta/src/error.rs	26.92% <0.00%> (-3.52%)	⬇️
... and 46 more

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[hengm3467]

@liurenjie1024 Hi Renjie, quick questions: what is the difference between these two modes (local & distributed)? How is it different from batch & streaming mode? Thanks.

[liurenjie1024]

@liurenjie1024 Hi Renjie, quick questions: what is the difference between these two modes (local & distributed)? How is it different from batch & streaming mode? Thanks.

Local mode is optimized for highly concurrent, simple point queries.
Distributed mode is optimized for complex queries.

They are both sub mode of batch execution, and is not related to streaming.

[hengm3467]

@liurenjie1024 Thanks a lot for the detailed explanation. It helps a lot!