<https://stackoverflow.com/posts/64661000/timeline>
Hi Solr users While reading through the solr docs <https://lucene.apache.org/solr/guide/6_6/transforming-result-documents.html#TransformingResultDocuments-_subquery_>, it states '*[subquery] is an improvement over [child]'*. On deep diving through the docs 1,* [subquery] definitely *seems better wrt. the capabilities/offerings (sorting of nested documents, etc). It gives much more control as compared to the *[child]* transformer *But is it better (or equivalent) in terms of performance as well ?* 1 of the requirements of my current project is to sort the child documents for every parent. *[child]* doesn't seem to have that support. *[subquery]* has it, but I am hesitant to migrate to it as it seems to be more expensive. As per my understanding, *[child]* only gets executed within the boundaries of the child docs for a given parent. Whereas *[subquery]* gets executed across the index. Hence the [*Subquery]* transformer seems to be more expensive than [*Child].* Please help in validating this hypothesis. "*Can I use the [subquery] transformer as efficiently as the [child] transformer itself ???*" Any details/insights wrt the performance comparisons will be appreciated. Thanks, Harshit
