bugfix: ColumnUtils delEscape with scheme error.

[jsbxyyx]

Ⅰ. Describe what this PR did

fix ColumnUtils#delEscape like `scheme`.`table` error, optimize KeywordChecker checkAndReplace method.

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-commenter]

Codecov Report

Merging #2875 into develop will decrease coverage by 0.03%.
The diff coverage is 100.00%.

@@              Coverage Diff              @@
##             develop    #2875      +/-   ##
=============================================
- Coverage      50.13%   50.10%   -0.04%     
+ Complexity      3022     3017       -5     
=============================================
  Files            598      598              
  Lines          19304    19297       -7     
  Branches        2350     2351       +1     
=============================================
- Hits            9678     9668      -10     
+ Misses          8664     8662       -2     
- Partials         962      967       +5     

Impacted Files	Coverage Δ	Complexity Δ
...source/undo/mysql/keyword/MySQLKeywordChecker.java	98.90% <ø> (-0.01%)	3.00 <0.00> (-2.00)
...urce/undo/oracle/keyword/OracleKeywordChecker.java	94.69% <ø> (-2.30%)	7.00 <0.00> (-4.00)
...o/postgresql/keyword/PostgresqlKeywordChecker.java	91.00% <ø> (+1.47%)	6.00 <0.00> (-1.00)	⬆️
.../main/java/io/seata/rm/datasource/ColumnUtils.java	80.00% <100.00%> (+1.42%)	20.00 <0.00> (+1.00)
...va/io/seata/rm/datasource/exec/DeleteExecutor.java	100.00% <100.00%> (ø)	6.00 <0.00> (ø)
.../seata/rm/datasource/exec/MultiDeleteExecutor.java	100.00% <100.00%> (ø)	9.00 <0.00> (ø)
...tasource/sql/struct/cache/MysqlTableMetaCache.java	82.35% <100.00%> (-0.21%)	10.00 <1.00> (ø)
...rce/sql/struct/cache/PostgresqlTableMetaCache.java	75.86% <100.00%> (-0.28%)	10.00 <0.00> (ø)
...ource/sql/struct/cache/AbstractTableMetaCache.java	71.42% <0.00%> (-14.29%)	8.00% <0.00%> (ø%)
... and 3 more

[slievrly]

LGTM

[funky-eyes]

LGTM

[l81893521]

LGTM

[yueyuanyu]

大佬 我们在整合seata时遇到了很多问题.其中一个问题就是这个schema '数据库名'.'表名' 我们自己定位delxxx那个方法上手动改变成去除" . " 情况后事务正常回滚,但是合并了你的pr后,现在的情况是分支事务正常回滚,但是调用方却疯狂的耍SQL异常 有脏数据.Caused by: java.sql.SQLException: Has dirty records when undo. 尝试清除seata库里的数据,undolog表数据.重新测试依旧是这个情况,应该是合并了你这个pr后发生的情况. 我们dao层用的jooq.springcloud为E,springboot1.5.6