Norikra::Udf::Lookup
Norikra UDF to lookup external data source. (Currently, only TSV file)
Installation
Add this line to your application's Gemfile:
gem 'norikra-udf-lookup'
And then execute:
$ bundle
Or install it yourself as:
$ gem install norikra-udf-lookup
Usage
lookup_tsv(string, string, string)
Parameters are: TSV file path, key to lookup, return value if the key was not found.
Lookup key in TSV file and return corresponding value.
For example, create such file with "key
% cat /tmp/lookuptest.tsv
1 aaa
2 bbb
3 ccc
Register query with this UDF.
SELECT
id, lookup_tsv('/tmp/lookuptest.tsv',id,'not found') as name, count(*) as cnt
FROM
test_stream.win:time_batch(1 min)
GROUP by id
Send some events.
% echo '{"id":"1"}' | norikra-client event send test_stream
% echo '{"id":"2"}' | norikra-client event send test_stream
% echo '{"id":"3"}' | norikra-client event send test_stream
% echo '{"id":"4"}' | norikra-client event send test_stream
Then, you will get there records.
{"time":"2015/07/28 12:13:24","query":"lookuptest","id":"3","cnt":1,"name":"ccc"}
{"time":"2015/07/28 12:13:24","query":"lookuptest","id":"2","cnt":1,"name":"bbb"}
{"time":"2015/07/28 12:13:24","query":"lookuptest","id":"1","cnt":1,"name":"aaa"}
{"time":"2015/07/28 12:13:24","query":"lookuptest","id":"4","cnt":1,"name":"not found"}
Copyright
- Copyright (c) 2015- OGIBAYASHI Hironori
- License
- GPL v2