perf(expr): optimize to_char function with constant template

[TennyZhuang]

Signed-off-by: TennyZhuang [email protected]

I hereby agree to the terms of the Singularity Data, Inc. Contributor License Agreement.

What's changed and what's your intention?

Optimize to_char

We may need more expression template for context :)

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)

Refer to a related PR or issue link (optional)

[github-actions]

license-eye has totally checked 2109 files.

Valid	Invalid	Ignored	Fixed
1025	1	1083	0

Click to see the invalid file list

• src/expr/src/expr/expr_to_char_const_tmpl.rs

[BugenZhao]

LGTM

[codecov]

Codecov Report

Merging #5130 (c06327d) into main (a14d883) will decrease coverage by 0.09%.
The diff coverage is 48.18%.

@@            Coverage Diff             @@
##             main    #5130      +/-   ##
==========================================
- Coverage   74.21%   74.11%   -0.10%     
==========================================
  Files         882      883       +1     
  Lines      134837   135323     +486     
==========================================
+ Hits       100069   100298     +229     
- Misses      34768    35025     +257     

Flag	Coverage Δ
rust	74.11% <48.18%> (-0.10%)	⬇️

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

Impacted Files	Coverage Δ
src/batch/src/executor/hash_agg.rs	93.08% <ø> (-0.03%)	⬇️
src/common/src/error.rs	72.19% <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/expr/src/error.rs	25.00% <ø> (ø)
src/expr/src/expr/build_expr_from_prost.rs	55.51% <0.00%> (-2.48%)	⬇️
src/expr/src/expr/expr_to_char_const_tmpl.rs	0.00% <0.00%> (ø)
src/expr/src/expr/mod.rs	48.93% <ø> (ø)
src/expr/src/vector_op/to_char.rs	0.00% <0.00%> (ø)
src/frontend/src/handler/create_source.rs	78.94% <0.00%> (-14.81%)	⬇️
... and 50 more

📣 We’re building smart automated test selection to slash your CI/CD build times. Learn more