Joel Bernstein created SOLR-8936:
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Summary: Push down the DISTINCT operation into the /export
handler, to support exporting distinct edges during a graph traversal
Key: SOLR-8936
URL: https://issues.apache.org/jira/browse/SOLR-8936
Project: Solr
Issue Type: New Feature
Reporter: Joel Bernstein
The /export handler sorts all results by specified fields as it streams out
results. We can use the sort order to perform a reduce style distinct operation
as docs are being sent out.
This can be used in the SQL handler, effectively removing the need for
map_reduce mode SELECT DISTINCT operations.
But the primary driver for this is to export distinct edges during a graph
traversal, which will eliminate a huge amount of network traffic during large
traversals.
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