[TomHAnderson]

A filter's or is a list of branches, any of which a row matches. Each branch is a filter whose own filters are all matched, of a FilterBranch type: the same filters less sort and sortPriority, with an _or of its own. Collection filters and computed fields, with their args, have it too.

• Filter\QueryBuilder's filter methods return their conditions rather than adding them; apply() adds the top-level conditions one by one, so a filter without _or builds the same DQL. A branch with no conditions is 1 = 1, keeping the parameters other branches bound; _or: [] matches nothing, as in: [] does.
• The filterDepth (default 3) and filterConditions (default 100) config limit _or before any DQL is built, with a client error. Only conditions inside _or are counted; 0 or null is unlimited.
• A field, alias or computed field named _or throws Exception\Metadata.
• A field given null, such as { name: null }, raised a PHP warning; it is not applied, as a filter given null is not.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (3208415) to head (b55caff).
⚠️ Report is 3 commits behind head on 14.1.x.

Additional details and impacted files

@@             Coverage Diff              @@
##              14.1.x      #319    +/-   ##
============================================
  Coverage     100.00%   100.00%            
- Complexity      1276      1318    +42     
============================================
  Files             81        81            
  Lines           3490      3597   +107     
============================================
+ Hits            3490      3597   +107     

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