CloudLoggingからBigQueryに流したログ(tsv in json)をみる ref: http://qiita.com/ikuwow/items/28369c4dc31a832a6ca1
-- use regacy sqlはoff
SELECT
REGEXP_EXTRACT(textPayload,r'^(?:[^\t]*\t){0}([^\t]*).*') AS field1,
REGEXP_EXTRACT(textPayload,r'^(?:[^\t]*\t){1}([^\t]*).*') AS field2,
REGEXP_EXTRACT(textPayload,r'^(?:[^\t]*\t){2}([^\t]*).*') AS field3,
...
FROM
`projectname.datasetname.somelogs_*`
;