arina-ielchiieva 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_r314354293
########## 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: Review comment: ```suggestion 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: ``` ---------------------------------------------------------------- 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: us...@infra.apache.org With regards, Apache Git Services
