fix(tianmu): fix UNION of non-matching columns and express with aggregation (#1861 #1864 #1873 #1870)

[adofsauron]

修改的代码逻辑

1. 当包含表达式的投影的聚合在处理时, 存在聚合为空的情况, 此时需要进行表达式计算
2. 当创建临时表时, decimal的精度存在校验, 但是这里的校验与物理表不一致, 而且没有对后续的逻辑产生正当作用, 具体看mtr测试的场景

Summary about this PR

Issue Number: close #1861 #1864 #1873 #1870

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]

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[codecov]

Codecov Report

Patch coverage: 88.88% and project coverage change: -0.02 ⚠️

Comparison is base (6b369e5) 55.17% compared to head (382bb32) 55.15%.

Additional details and impacted files

@@                 Coverage Diff                 @@
##           stonedb-5.7-dev    #1881      +/-   ##
===================================================
- Coverage            55.17%   55.15%   -0.02%     
===================================================
  Files                 2031     2031              
  Lines               431521   431521              
===================================================
- Hits                238085   238016      -69     
- Misses              193436   193505      +69     

Impacted Files	Coverage Δ
storage/tianmu/core/temp_table.cpp	74.64% <ø> (+1.70%)	⬆️
storage/tianmu/optimizer/aggregation_algorithm.cpp	56.28% <83.33%> (+0.32%)	⬆️
storage/tianmu/core/engine_execute.cpp	58.56% <100.00%> (ø)
storage/tianmu/core/query_compile.cpp	65.36% <100.00%> (+0.90%)	⬆️

... and 86 files with indirect coverage changes

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[RingsC]

LGTM

[zhongshengstoneatom]

LGTM.

various_join.test should be changed to guarantee a stable result