google bigquery - FIRST() function: Unrecognized is not currently supported as an analytic function -


when run aerobic-forge-504:job_4_p6sq__0c5_3b-nvyvgg-y2gf4 job, got pretty weird error message

select  fullvisitorid fullvisitorid,         date,         (visitstarttime+hits.time) time,         first(customdimensions.value) over(partition fullvisitorid)         flatten([google.com:analytics-bigquery:londoncyclehelmet.ga_sessions_20130910] ,customdimensions) customdimensions.index=2 limit 100

error: unrecognized not supported analytic function. not sure wrong here.

i want return first customdimemsion value index=2 date first recorded. since customdimension , hits both repeated fields, , somehow separated not sure if possible.

the proper name analytic function in sql standard first_value. first aggregation function in bigquery. query be

select  fullvisitorid fullvisitorid,         date,         (visitstarttime+hits.time) time,         first_value(customdimensions.value) over(partition fullvisitorid)         flatten([google.com:analytics-bigquery:londoncyclehelmet.ga_sessions_20130910] ,customdimensions) customdimensions.index=2 limit 100

update answer question

i want return first customdimemsion value index=2 date first recorded.

i try use hits.customdimensions.[index|value], i.e.

select fullvisitorid, date, visitstarttime + first_hit_time, value ( select  fullvisitorid,         date,         visitstarttime,         first(hits.customdimensions.value) within hits value,         first(hits.time) within hits first_hit_time [google.com:analytics-bigquery:londoncyclehelmet.ga_sessions_20130910] hits.customdimensions.index = 2)

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