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Update post-aggregations.md
fix for the issue: https://github.com/druid-io/druid/issues/1584
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@ -43,7 +43,7 @@ This returns the value produced by the specified [aggregator](../querying/aggreg
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`fieldName` refers to the output name of the aggregator given in the [aggregations](../querying/aggregations.html) portion of the query.
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```json
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{ "type" : "fieldAccess", "fieldName" : <aggregator_name> }
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{ "type" : "fieldAccess", "name": <output_name>, "fieldName" : <aggregator_name> }
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```
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### Constant post-aggregator
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