[PR] Fix elemMatch null object array handling [pouchdb]

["henyanagar (via GitHub)" <gi...@apache.org>]

henyanagar opened a new pull request, #9257:
URL: https://github.com/apache/pouchdb/pull/9257

   Title:
   Fix elemMatch with null elements in object arrays
   
   Body:
   Fixes #9103
   
   ### Summary
   
   This updates `$elemMatch` handling for arrays that contain both objects and `null` values.
   
   Previously, `$elemMatch` decided whether to use `rowFilter()` based only on the first array element. If the first element was an object, later `null` entries were still passed into `rowFilter()`, which could throw a TypeError when resolving nested fields.
   
   The updated logic checks each array element before applying object-field matching, so `null` entries are ignored for object-field `$elemMatch` selectors instead of throwing.
   
   ### Testing
   
   * Added a regression test for `$elemMatch` with an object array containing `null`.
   * Verified the new test fails before the fix with:
     `TypeError: Cannot read properties of null`
   * Verified after the fix:
     `1 passing`
   * Verified the full elem-match test file:
     `7 passing`
   * Ran ESLint on the changed source and test files.
   


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Re: [PR] Fix elemMatch null object array handling [pouchdb]

["janl (via GitHub)" <gi...@apache.org>]

janl commented on PR #9257:
URL: https://github.com/apache/pouchdb/pull/9257#issuecomment-4729035409

   Hi, thank you for your contribution. Would you be able to use our pull request template, so we can process your submission according to our guidelines? Thank you.


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