test(mtr): add more test cases for tianmu(#1196)

[davidshiz]

[summary]
case_when.test
drop_restric.test
empty_string_not_null.test
left_right_func.test
like_not_like.test
multi_join.test
order_by.test
ssb_small.test
union_case.test

Summary about this PR

Issue Number: ref #1196

Tests Check List

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No code

Changelog

• New Feature
• Bug Fix
• Performance Improvement
• Build/Testing/CI/CD
• Documentation
• Not for changelog (changelog entry is not required)

Documentation

• Affects user behaviors
• Contains syntax changes
• Contains variable changes
• Contains experimental features

[mergify]

Thanks for the contribution!
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[codecov]

Codecov Report

Patch coverage has no change and project coverage change: -0.95 ⚠️

Comparison is base (798ca7a) 55.15% compared to head (badb133) 54.21%.

❗ Current head badb133 differs from pull request most recent head 80a3ca4. Consider uploading reports for the commit 80a3ca4 to get more accurate results

Additional details and impacted files

@@                 Coverage Diff                 @@
##           stonedb-5.7-dev    #1888      +/-   ##
===================================================
- Coverage            55.15%   54.21%   -0.95%     
===================================================
  Files                 2031     2031              
  Lines               431521   431521              
===================================================
- Hits                238018   233948    -4070     
- Misses              193503   197573    +4070     

see 241 files with indirect coverage changes

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[Nliver]

LGTM