[SOLR-17225] Sleep function query to sleep on execution rather than parsing

• Type: Improvement
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 9.5
• Component/s: function query, Tests
• Labels: test
• Assignee: Unassigned
• Reporter: Alessandro Benedetti
• Created: 05/Apr/24 10:24
• Updated: 29/May/24 23:56

Description

Currently, there is a sleep(x,y) function query available in Apache Solr.

This function query sleeps for <x> ms and then return <y> as a value.

Currently the sleep happens on query parsing, rather than execution.

This can cause a problem in tests when used for example in Learning To Rank where a function query can be used as a SolrFeature.
In Learning To Rank the feature extraction is separated from the feature parsing (the weight generation).
The extraction happens per document while the parsing happens once.
So when using a sleep feature you expect the sleep to happens whenever you extract the value of the feature rather than at parsing time.