drill-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From GitBox <...@apache.org>
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
+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
+   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

This is an automated message from the Apache Git Service.
To respond to the message, please log on to GitHub and use the
URL above to go to the specific comment.
For queries about this service, please contact Infrastructure at:

With regards,
Apache Git Services

View raw message