optimize: optimize some files

[slievrly]

• I have registered the PR changes.

Ⅰ. Describe what this PR did

optimize some files

Ⅱ. Does this pull request fix one issue?

Ⅲ. Why don't you add test cases (unit test/integration test)?

Ⅳ. Describe how to verify it

Ⅴ. Special notes for reviews

[funky-eyes]

LGTM

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (26feac2) 50.00% compared to head (504c78c) 49.83%.
Report is 2 commits behind head on 2.x.

Additional details and impacted files

@@             Coverage Diff              @@
##                2.x    #6238      +/-   ##
============================================
- Coverage     50.00%   49.83%   -0.18%     
+ Complexity     4932     4926       -6     
============================================
  Files           915      917       +2     
  Lines         31927    31995      +68     
  Branches       3855     3862       +7     
============================================
- Hits          15966    15944      -22     
- Misses        14400    14490      +90     
  Partials       1561     1561              

Files	Coverage Δ
.../io/seata/core/rpc/netty/v1/ProtocolV1Encoder.java	5.12% <ø> (ø)
.../java/io/seata/sqlparser/druid/BaseRecognizer.java	80.95% <ø> (ø)
...a/sqlparser/druid/oracle/BaseOracleRecognizer.java	35.29% <ø> (ø)
...ser/druid/postgresql/BasePostgresqlRecognizer.java	23.21% <ø> (ø)
...arser/druid/sqlserver/BaseSqlServerRecognizer.java	54.54% <ø> (ø)

... and 21 files with indirect coverage changes

[funky-eyes]

LGTM

[liuqiufeng]

LGTM

[xingfudeshi]

LGTM