* fix: refactor Count method and add test
* fix: add the change record into the CHANGELOG.md
* fix: refactor the readSQL method and let countSQL reuse readSQL method
* fix: fix the bug in the construction process of the order by clause
* fix: modify the TestCountOrderBy、add the TestCount and TestOrderBy
* fix: move the change record in CHANGELOG.md to developing
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Co-authored-by: Ken <azai8599@163.com>