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Subject [GitHub] [drill] cgivre commented on a change in pull request #1840: DRILL-7343: Add User-Agent UDFs to Drill
Date Thu, 05 Sep 2019 13:09:06 GMT
cgivre commented on a change in pull request #1840: DRILL-7343: Add User-Agent UDFs to Drill
URL: https://github.com/apache/drill/pull/1840#discussion_r321247553
 
 

 ##########
 File path: contrib/udfs/README.md
 ##########
 @@ -0,0 +1,58 @@
+# Drill User Defined Functions
+
+This `README` documents functions which users have submitted to Apache 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
+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.`/tmp/data/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
+FROM (
+   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:
+```
+SELECT parse_user_agent( `user_agent`, 'AgentName` ) as AgentName ...
+```
+which will just return the requested field.  If the user agent string is empty, all fields
will have the value of `Hacker`.  
+
+Note: This function does not accept `NULL` as input. 
 
 Review comment:
   Removed and Fixed

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