User Defined Function for Apache Drill


This is an Apache Drill UDF for parsing User Agent Strings. This function was originally created by Charles S. Givre and was imported into the main Yauaa project to ensure users would have a prebuilt and up to date version available.

STATUS: ... Works on my machine ...

I have copied/implemented the functions

parse_user_agent       ( <useragent> )
parse_user_agent_field ( <useragent> , <desired fieldname> )

Able to do basic unit test during build for the parse_user_agent_field function. NOT yet able to do automated testing for the parse_user_agent function.

When I run it in a local drill the things I try work for the most (see below). I have not yet tested this in a distributed setup.

So please try it out and report any issues and/or improvements you see.

Getting the UDF

You can get the prebuilt UDF from maven central.

If you use a maven based project simply add this dependency to your project.



To install this function put the jar file in the <drill-path>/jars/3rdparty directory.

cp yauaa-drill-<version>.jar <drill-path>/jars/3rdparty

Make sure you replace <drill-path> with your actual path to your drill installation. NOTE: You do not need the yauaa-drill-<version>-sources.jar to run in drill.

Usage and examples

Working queries with a direct value

SELECT parse_user_agent_field('Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/48.0.2564.82 Safari/537.36', 'AgentNameVersion') from (values(1));

|        EXPR$0        |
| Chrome 48.0.2564.82  |

This one doesn't work

SELECT parse_user_agent('Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/48.0.2564.82 Safari/537.36') from (values(1));

Error: PLAN ERROR: Failure while materializing expression in constant expression evaluator [PARSE_USER_AGENT('Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/48.0.2564.82 Safari/537.36')].  Errors:
Error in expression at index -1.  Error: Only ProjectRecordBatch could have complex writer function. You are using complex writer function parse_user_agent in a non-project operation!.  Full expression: --UNKNOWN EXPRESSION--.

Assume the file /tmp/testcase.tsv which contains 2 lines:

Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/48.0.2564.82 Safari/537.36
Mozilla/5.0 (iPhone; CPU iPhone OS 8_3 like Mac OS X) AppleWebKit/600.1.4 (KHTML, like Gecko) Version/8.0 Mobile/12F70 Safari/600.1.4 (compatible; Googlebot/2.1; +

Working queries using the input file

SELECT parse_user_agent_field(columns[0], 'AgentNameVersion') AS AgentNameVersion from dfs.`/tmp/testcase.tsv`;

|   AgentNameVersion   |
| Chrome 48.0.2564.82  |
| Googlebot 2.1        |


SELECT parse_user_agent(columns[0]) AS AgentNameVersion from dfs.`/tmp/testcase.tsv`;

| AgentNameVersion |
| {
    "DeviceClass":                   "Desktop",
    "DeviceName":                    "Linux Desktop",
    "DeviceBrand":                   "Unknown",
    "DeviceCpu":                     "Intel x86_64",
    "DeviceCpuBits":                 "64",
    "OperatingSystemClass":          "Desktop",
    "OperatingSystemName":           "Linux",
    "OperatingSystemVersion":        "Intel x86_64",
    "OperatingSystemNameVersion":    "Linux Intel x86_64",
    "LayoutEngineClass":             "Browser",
    "LayoutEngineName":              "Blink",
    "LayoutEngineVersion":           "48.0",
    "LayoutEngineVersionMajor":      "48",
    "LayoutEngineNameVersion":       "Blink 48.0",
    "LayoutEngineNameVersionMajor":  "Blink 48",
    "AgentClass":                    "Browser",
    "AgentName":                     "Chrome",
    "AgentVersion":                  "48.0.2564.82",
    "AgentVersionMajor":             "48",
    "AgentNameVersion":              "Chrome 48.0.2564.82",
    "AgentNameVersionMajor":         "Chrome 48"                        } |
| {
    "DeviceClass":                   "Robot Mobile",
    "DeviceName":                    "Google",
    "DeviceBrand":                   "Google",
    "OperatingSystemClass":          "Cloud",
    "OperatingSystemName":           "Google",
    "OperatingSystemVersion":        "Google",
    "OperatingSystemNameVersion":    "Google",
    "LayoutEngineClass":             "Robot",
    "LayoutEngineName":              "Googlebot",
    "LayoutEngineVersion":           "Googlebot",
    "LayoutEngineVersionMajor":      "Googlebot",
    "LayoutEngineNameVersion":       "Googlebot",
    "LayoutEngineNameVersionMajor":  "Googlebot",
    "AgentClass":                    "Robot Mobile",
    "AgentName":                     "Googlebot",
    "AgentVersion":                  "2.1",
    "AgentVersionMajor":             "2",
    "AgentNameVersion":              "Googlebot 2.1",
    "AgentNameVersionMajor":         "Googlebot 2",
    "AgentInformationUrl":           ""   } |

The function returns a Drill map, so you can access any of the fields using Drill's notation. For example, the query below illustrates how to extract a field from this map and summarize it:

SELECT AS Browser,
COUNT( * ) AS BrowserCount
   SELECT parse_user_agent( columns[0] ) AS ua
   FROM dfs.`/tmp/testcase.tsv`
) AS uadata
ORDER BY BrowserCount DESC;

|       Browser        | BrowserCount  |
| Chrome 48.0.2564.82  | 1             |
| Googlebot 2.1        | 1             |

results matching ""

    No results matching ""