fix SMW\SQLStore\EntityStore\PrefetchCache cache key overwrap

[hkwi]

There is a case that key from makeCacheKey is same, but fingerprint from subjects are different, typically with subobject property path resolution.
SemanticMediaWiki/SemanticResultFormats#825

Using same PrefetchCache, if there comes new prefetch call with same key but different fingerprint, then the old cache will be replaced with the new result.
I think we should merge the result here.

Summary by CodeRabbit

• Refactor
  • Improved cache merging in the prefetch functionality to enhance data retrieval efficiency.
• Tests
  • Added new test methods testMultiCacheAndFetch and testCacheMergeWithDifferentFingerprints to validate caching, fetching multiple items, and merging items with different fingerprints based on certain conditions.

[coderabbitai]

Walkthrough

The changes across these files enhance the caching mechanism, optimizing data storage and retrieval. The update in PrefetchCache.php refines the prefetch method to merge new results with existing cache. Additionally, new test methods in PrefetchCacheTest.php validate caching multiple items and merging based on different fingerprints, ensuring robust cache management.

Changes

File Path	Change Summary
.../EntityStore/PrefetchCache.php	Updated prefetch to merge new results with existing cache.
.../EntityStore/PrefetchCacheTest.php	Added testMultiCacheAndFetch and testCacheMergeWithDifferentFingerprints to test caching and merging based on fingerprints.

Poem

🐇✨
In the realm of code and cache,
A rabbit danced, a plan to make.
Merging old with new, so spry,
Where data rests, where data lie.
Hop, skip, a joyful tweak,
Cache now plays hide and seek!
🌟📜

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Recent Review Details

Configuration used: CodeRabbit UI

Commits

Files that changed from the base of the PR and between aa36a15 and bce58a9.

Files selected for processing (1)

• tests/phpunit/SQLStore/EntityStore/PrefetchCacheTest.php (1 hunks)

Additional comments not posted (1)

tests/phpunit/SQLStore/EntityStore/PrefetchCacheTest.php (1)

89-127: The test method testCacheMergeWithDifferentFingerprints is well-structured and effectively tests the new functionality of merging cache entries with different fingerprints. The use of willReturnOnConsecutiveCalls is appropriate for simulating different return values for the same method call under different conditions. This test ensures that the PrefetchCache correctly handles multiple prefetches with different fingerprints, storing and retrieving them accurately.

However, consider adding assertions to check the internal state of the cache after each prefetch operation. This would help verify not only the output but also the state of the cache throughout the process, ensuring that the merge operation is performed as expected.

Consider enhancing the test by adding assertions to verify the state of the cache after each prefetch operation. This would provide a more thorough validation of the cache's behavior during merges.

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[coderabbitai]

Actionable comments posted: 1

[jaideraf]

@hkwi is this pull request ready to be merged?

[jaideraf]

@Seb35 I think this is related to #5036. Could you please take a look at it?