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The combination of the fields
event_name
,event_timestamp
,user_pseudo_id
, andevent_bundle_sequence_id
are used to uniquely identify each record in the GA4 BigQuery event export table. However, it seems from your results that there are instances of multiple rows having the same values in these columns but different event parameters. What could be happening is that theevent_params
field, which is nested and JSON-formatted, may contain varying information across multiple events even if the identifying fields are the same. The assumption that relatedevent_params
values would always appear in one row with the same identifying record could be incorrect. There might be a mix-up ofevent_params
data from different rows into one. A potential workaround for this could be to add a hash or fingerprint of the entireevent_params
object to the four mentioned fields, although there currently seems to be no surefire way of identifying unique records as of April 2023.