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added group key link to aggregate function doc

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Scott Anderson 2019-04-25 11:17:48 -06:00
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content/v2.0/query-data/guides/custom-functions/custom-aggregate.md
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@ -18,7 +18,7 @@ or create custom aggregate functions using the
Aggregate functions all have the same basic characteristics:
- They operate on individual input tables and transform all records into a single record.
- The output table has the same group key as the input table.
- The output table has the same [group key](/v2.0/query-data/get-started/#group-keys) as the input table.
## How reduce() works
The `reduce()` function operates on one row at a time using the function defined in