1. optimization SQL join

[andyqian]

Ⅰ. Describe what this PR did

1. optimization SQL join

[codecov-io]

Codecov Report

Merging #1274 into develop will decrease coverage by 0.11%.
The diff coverage is 0%.

@@             Coverage Diff              @@
##             develop   #1274      +/-   ##
============================================
- Coverage      49.41%   49.3%   -0.12%     
- Complexity      1651    1659       +8     
============================================
  Files            326     326              
  Lines          11448   11500      +52     
  Branches        1416    1423       +7     
============================================
+ Hits            5657    5670      +13     
- Misses          5161    5201      +40     
+ Partials         630     629       -1

Impacted Files	Coverage Δ	Complexity Δ
...va/io/seata/rm/datasource/exec/UpdateExecutor.java	0% <0%> (ø)	0 <0> (ø)	⬇️
.../rm/datasource/exec/BaseTransactionalExecutor.java	35.71% <0%> (+3.96%)	6 <0> (ø)	⬇️
...va/io/seata/rm/datasource/exec/InsertExecutor.java	57.97% <0%> (-0.86%)	14 <0> (ø)
...va/io/seata/rm/datasource/exec/DeleteExecutor.java	0% <0%> (ø)	0 <0> (ø)	⬇️
...java/io/seata/spring/tcc/TccActionInterceptor.java	12.69% <0%> (-0.13%)	4% <0%> (+2%)
...a/rm/tcc/interceptor/ActionInterceptorHandler.java	27.27% <0%> (+1.89%)	13% <0%> (+6%)	⬆️

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[slievrly]

LGTM, java8 api: StringJoiner

[xingfudeshi]

LGTM.