ASF GitHub Bot commented on DRILL-7343:

arina-ielchiieva commented on pull request #1840: DRILL-7343: Add User-Agent 
UDFs to Drill
URL: https://github.com/apache/drill/pull/1840#discussion_r314354355

 File path: contrib/udfs/README.md
 @@ -0,0 +1,56 @@
+# Drill User Defined Functions
+This `README` documents functions which users have submitted to Apaceh Drill.  
+## User Agent Functions
+Drill UDF for parsing User Agent Strings.
+This function is based on Niels Basjes Java library for parsing user agent 
strings which is available here:  https://github.com/nielsbasjes/yauaa.
+### Usage
+Using this function is fairly simple. The function `parse_user_agent()` takes 
a user agent string as an argument and returns a map of the available fields.  
Note that not every field will be present in every user agent string. 
+SELECT parse_user_agent( columns[0] ) as ua 
+FROM dfs.`/Users/cgivre/drill-httpd/ua.csv`;
+The query above returns:
+  "DeviceClass":"Desktop",
+  "DeviceName":"Macintosh",
+  "DeviceBrand":"Apple",
+  "OperatingSystemClass":"Desktop",
+  "OperatingSystemName":"Mac OS X",
+  "OperatingSystemVersion":"10.10.1",
+  "OperatingSystemNameVersion":"Mac OS X 10.10.1",
+  "LayoutEngineClass":"Browser",
+  "LayoutEngineName":"Blink",
+  "LayoutEngineVersion":"39.0",
+  "LayoutEngineVersionMajor":"39",
+  "LayoutEngineNameVersion":"Blink 39.0",
+  "LayoutEngineNameVersionMajor":"Blink 39",
+  "AgentClass":"Browser",
+  "AgentName":"Chrome",
+  "AgentVersion":"39.0.2171.99",
+  "AgentVersionMajor":"39",
+  "AgentNameVersion":"Chrome 39.0.2171.99",
+  "AgentNameVersionMajor":"Chrome 39",
+  "DeviceCpu":"Intel"
+The function returns a Drill map, so you can access any of the fields using 
Drill's table.map.key notation.  For example, the query below illustrates how 
to extract a field from this map and summarize it:
+SELECT uadata.ua.AgentNameVersion AS Browser,
+COUNT( * ) AS BrowserCount
+   SELECT parse_user_agent( columns[0] ) AS ua
+   FROM dfs.drillworkshop.`user-agents.csv`
+) AS uadata
+GROUP BY uadata.ua.AgentNameVersion
+ORDER BY BrowserCount DESC
+The function can also be called with an optional field as an argument.  IE:
 Review comment:
   The function can also be called with an optional field as an argument. IE:
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> Add User-Agent UDFs to Drill
> ----------------------------
>                 Key: DRILL-7343
>                 URL: https://issues.apache.org/jira/browse/DRILL-7343
>             Project: Apache Drill
>          Issue Type: New Feature
>    Affects Versions: 1.17.0
>            Reporter: Charles Givre
>            Assignee: Charles Givre
>            Priority: Major
>             Fix For: 1.17.0
> This collection of UDFs adds the ability to parse user agent strings which is 
> useful for security data analysis. 

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