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Greptile Overview

Greptile Summary

This PR fixes result cache handling for histogram queries by addressing several issues:

• Histogram interval awareness in cache deltas: The calculate_deltas function now accounts for histogram bucket widths when computing cache misses, avoiding duplicate data at interval boundaries
• Improved cache hit filtering: Cached hits are now filtered using hit_ts + histogram_interval to ensure histogram buckets that span the query boundary are properly excluded
• Cache time range alignment: Changed from using data-derived timestamps (final_start_time/final_end_time) to query-aligned timestamps (accept_start_time/accept_end_time) for cache storage, with histogram interval adjustment at end time
• Partition alignment relaxation: Reduced the threshold for histogram alignment from min_step * 3 to min_step, allowing more queries to benefit from aligned partitions
• Removed enterprise-only mismatched interval cleanup: The delete_mismatched_interval_cache_files code was removed from the streaming execution path
• Enhanced logging: Added elapsed time and partition details to various log messages for better debugging

Confidence Score: 4/5

• This PR is safe to merge - the changes are targeted fixes to histogram caching logic with clear intent and no breaking API changes.
• The changes are well-focused on fixing histogram cache handling. The logic changes are straightforward and improve correctness. Minor risk around the partition threshold change and removed enterprise cleanup code, but these appear intentional for the fix.
• src/service/search/cache/mod.rs - Core cache write logic changes. src/service/search/streaming/execution.rs - Removed enterprise cache cleanup code.

Important Files Changed

File Analysis

Sequence Diagram

sequenceDiagram
    participant Client
    participant SearchService
    participant CacheChecker
    participant CacheStorage
    participant PartitionGen
    
    Client->>SearchService: search request (histogram query)
    SearchService->>CacheChecker: check_cache()
    CacheChecker->>CacheStorage: get_cached_results()
    CacheStorage-->>CacheChecker: cached response
    
    Note over CacheChecker: Filter hits with histogram_interval<br/>hit_ts + interval < end_time
    
    CacheChecker->>CacheChecker: calculate_deltas(histogram_interval)
    
    Note over CacheChecker: For histogram queries:<br/>delta_start_time = result.end_time<br/>(no +1 offset)
    
    CacheChecker-->>SearchService: deltas + cached data
    
    alt Has deltas to fetch
        SearchService->>PartitionGen: generate_partitions()
        Note over PartitionGen: Alignment threshold:<br/>duration > min_step<br/>(was min_step * 3)
        PartitionGen-->>SearchService: partitions
        SearchService->>SearchService: execute delta queries
    end
    
    SearchService->>CacheStorage: write_results()
    Note over CacheStorage: Use accept_start/end_time<br/>Adjust end_time by histogram interval
    
    SearchService-->>Client: merged response