optimize: keep the same logic of get table meta

[l81893521]

Ⅰ. Describe what this PR did

Keep the same logic of get table meta. And make it more readable.

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 #2561 into develop will decrease coverage by 0.01%.
The diff coverage is 37.50%.

@@              Coverage Diff              @@
##             develop    #2561      +/-   ##
=============================================
- Coverage      51.18%   51.17%   -0.02%     
+ Complexity      2806     2804       -2     
=============================================
  Files            554      554              
  Lines          17775    17772       -3     
  Branches        2101     2099       -2     
=============================================
- Hits            9098     9094       -4     
  Misses          7819     7819              
- Partials         858      859       +1     

Impacted Files	Coverage Δ	Complexity Δ
...asource/sql/struct/cache/OracleTableMetaCache.java	75.90% <0.00%> (ø)	9.00 <0.00> (ø)
...rce/sql/struct/cache/PostgresqlTableMetaCache.java	76.40% <33.33%> (+0.31%)	10.00 <1.00> (ø)
...tasource/sql/struct/cache/MysqlTableMetaCache.java	82.55% <66.66%> (ø)	10.00 <0.00> (ø)
...o/seata/server/coordinator/DefaultCoordinator.java	54.63% <0.00%> (-0.52%)	28.00% <0.00%> (-1.00%)
...in/java/io/seata/server/session/GlobalSession.java	83.71% <0.00%> (-0.46%)	71.00% <0.00%> (-1.00%)

[jsbxyyx]

LGTM

[slievrly]

LGTM