Fix issue-2578

[andyfengHKU]

Fix issue #2578

• Fix a bug when paring predicate in subquery.
• Fix a bug when using CASE in WHERE clause.
• Fix a bug in unary boolean executor.
• Fix a bug when using NULL key in index scan.

[codecov]

Codecov Report

Attention: 3 lines in your changes are missing coverage. Please review.

Comparison is base (1a33e48) 93.15% compared to head (e6d7ca8) 93.21%.
Report is 2 commits behind head on master.

Files	Patch %	Lines
src/binder/bind/bind_graph_pattern.cpp	93.33%	1 Missing ⚠️
...clude/function/boolean/boolean_function_executor.h	85.71%	1 Missing ⚠️
src/planner/operator/logical_plan_util.cpp	80.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2581      +/-   ##
==========================================
+ Coverage   93.15%   93.21%   +0.05%     
==========================================
  Files        1027     1027              
  Lines       38365    38631     +266     
==========================================
+ Hits        35740    36008     +268     
+ Misses       2625     2623       -2     

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[ray6080]

Better put a PR description so it's easy to understand what is happening.