KhushJain commented on code in PR #4691:
URL: https://github.com/apache/solr/pull/4691#discussion_r3717325807


##########
solr/solr-ref-guide/modules/query-guide/pages/stream-decorator-reference.adoc:
##########
@@ -1448,7 +1448,7 @@ For faster aggregation over low to moderate cardinality 
fields, the `facet` func
 * `StreamExpression` (Mandatory)
 * `over`: (Mandatory) A list of fields to group by.
 * `metrics`: (Mandatory) The list of metrics to compute.
-Currently supported metrics are `sum(col)`, `avg(col)`, `min(col)`, 
`max(col)`, `count(*)`, `missing(col)`, `countDist(col)`, `per(col, 
percentile)`.
+Currently supported metrics are `sum(col)`, `avg(col)`, `min(col)`, 
`max(col)`, `count(*)`, `missing(col)`, `countDist(col)`, `per(col, 
percentile)`, `std(col)`.

Review Comment:
   no dedicated per-metric docs exists, all streaming metrics are documented 
this same inline way. 
   
   Support for `missing(col)`, `countDist(col)` and `per(col, percentile)` are 
also added by me in the past.



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