refactor: simplify operation of map

[tswstarplanet]

Ⅰ. Describe what this PR did

Simplify some redundant code of operation of map

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

[codecov-io]

Codecov Report

Merging #1444 into develop will decrease coverage by 0.69%.
The diff coverage is 0%.

@@             Coverage Diff             @@
##             develop   #1444     +/-   ##
===========================================
- Coverage      46.39%   45.7%   -0.7%     
+ Complexity      1691    1664     -27     
===========================================
  Files            347     345      -2     
  Lines          12713   12669     -44     
  Branches        1589    1593      +4     
===========================================
- Hits            5898    5790    -108     
- Misses          6175    6230     +55     
- Partials         640     649      +9

Impacted Files	Coverage Δ	Complexity Δ
...rc/main/java/io/seata/core/rpc/ChannelManager.java	0% <0%> (ø)	0 <0> (ø)	⬇️
...java/io/seata/server/metrics/MeterIdConstants.java	0% <0%> (-96.56%)	0% <0%> (-1%)
...ava/io/seata/server/metrics/MetricsSubscriber.java	0% <0%> (-79.42%)	0% <0%> (-7%)
...n/java/io/seata/server/metrics/MetricsManager.java	0% <0%> (-76.93%)	0% <0%> (-5%)
...in/java/io/seata/server/session/GlobalSession.java	79.8% <0%> (-4.81%)	59% <0%> (-8%)
.../java/io/seata/rm/datasource/DataCompareUtils.java	70.73% <0%> (-4.62%)	27% <0%> (+2%)
...o/seata/server/coordinator/DefaultCoordinator.java	50% <0%> (-3.22%)	25% <0%> (-3%)
...seata/rm/datasource/sql/struct/TableMetaCache.java	50.62% <0%> (-1.23%)	12% <0%> (-1%)
...seata/rm/datasource/undo/AbstractUndoExecutor.java	83.15% <0%> (-0.02%)	20% <0%> (-1%)
...codec/protobuf/manager/ProtobufConvertManager.java	100% <0%> (ø)	5% <0%> (ø)	⬇️
... and 2 more

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[slievrly]

LGTM

[sharajava]

okey to me

[xingfudeshi]

LGTM.

[funky-eyes]

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