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https://issues.apache.org/jira/browse/SOLR-17775?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17956474#comment-17956474
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ASF subversion and git services commented on SOLR-17775:
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Commit 51b315ae7c570782b0d46cfb356d19f3d34d4fa5 in solr's branch
refs/heads/main from yura
[ https://gitbox.apache.org/repos/asf?p=solr.git;h=51b315ae7c5 ]
SOLR-17775: Speed up function queries in 'fl' param. (#3380)
By fetching the data in doc order (mechanical sympathy) up to a cached threshold
> Optimize ValueSourceAugmenter
> -----------------------------
>
> Key: SOLR-17775
> URL: https://issues.apache.org/jira/browse/SOLR-17775
> Project: Solr
> Issue Type: Improvement
> Components: search
> Reporter: Yura
> Priority: Minor
> Labels: pull-request-available
> Time Spent: 1h 40m
> Remaining Estimate: 0h
>
> h3. Problem
> ValueSourceAugmenter currently calculates function values on-demand during
> transform(), performing expensive binary searches and reader lookups for each
> document individually.
> h3. Solution
> Pre-calculate function values for all result set documents during
> setContext() by:
> * Collecting and sorting document IDs from DocList
> * Sequential iteration through sorted documents to calculate values once per
> reader segment
> * Storing results in hash map for O(1) lookup during transform()
> * Fallback to on-demand calculation for documents outside the pre-calculated
> set (RTG cases)
> h3. Performance Benefit
> Replaces repeated "find document at position N" operations (binary search per
> document) with efficient "get next document" iteration (sequential processing
> within reader segments), significantly reducing lookup overhead.
> h3. Compatibility
> Maintains full backward compatibility through fallback mechanism for edge
> cases.
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