Input
The input table is aggregate_clicks, from LAG and LEAD Expressions Example: No Alias for Input Query.
SQL-MapReduce Call
SELECT * FROM nPath ( ON aggregate_clicks PARTITION BY sessionid ORDER BY clicktime USING Mode (NONOVERLAPPING) Pattern ('REFERRER{2,}') Symbols (referrer IS NOT NULL AS REFERRER) Result ( FIRST (sessionid OF REFERRER) AS sessionid, FIRST (productname OF REFERRER) AS product ) ) AS dt ORDER BY dt.sessionid;
Output
sessionid | product |
---|---|
1 | envelopes |
2 | tables |
3 | bookcases |
4 | tables |
5 | Appliances |