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hello and welcome to this quarters firebolt tech tips today were going to talk about join indexes lets jump right in so im going to look at a query this is a query thats joining the fact table to a dimension table so were going to run this query notice that were doing a where predicate on the dimension table were also grouping by that dimension table so you can tell this query is taking a fair amount of time to run which is quite unacceptable so 11.88 seconds so lets look at why that query ran that long so lets do an explain plan on it and lets take a look so the first thing you notice is the explain plan is actually doing an inner join from the fact table to the dimension table so you can tell were doing a left outer join here but because of the wear predicate firebolt is converting that to an inner join fireball always prefers outer joins compared to inner joints the other thing to note here is that we are using the aggregating index on the fact table so theres not a lo