feature: 分库分表: 范围查询支持

[Stone-afk]

单元测试正在补

[codecov[bot]]

Codecov Report

Merging #181 (df53a2f) into dev (3fae3b6) will increase coverage by 2.31%. The diff coverage is 88.46%.

@@            Coverage Diff             @@
##              dev     #181      +/-   ##
==========================================
+ Coverage   82.55%   84.86%   +2.31%     
==========================================
  Files          36       36              
  Lines        2705     2723      +18     
==========================================
+ Hits         2233     2311      +78     
+ Misses        388      335      -53     
+ Partials       84       77       -7     

Impacted Files	Coverage Δ
expression.go	82.35% <ø> (ø)
predicate.go	92.00% <ø> (ø)
sharding_select.go	73.85% <88.00%> (+19.60%)	:arrow_up:
builder.go	85.96% <100.00%> (ø)

:mega: We’re building smart automated test selection to slash your CI/CD build times. Learn more

[Stone-afk]

[flycash]

先挂起，等你的 Datasource 合并进去再说

[flycash]

一般来说，error 分支都是要覆盖到的，除非实在是没办法。覆盖 error 分支很重要的一个点是确保程序如预期返回 error 了，也就是把行为固化下来；一方面也是为了确切验证，error 不仅返回了，还是我们预期的那个 error。比如说之前我们就遇到过，虽然都返回了 error，但是 error 其实是另外一个 error，引起的线上故障。