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I've exported the Google Firebase events raw data to the Google BigQuery. Each event has four key: name, params, timestamp_micros, previous_timestamp_micros. As a example, I past a session_start event below which is extracted from my data

"event_dim":[
    {"name":"session_start",
     "params":[
         {"key":"firebase_event_origin",
          "value":{"string_value":"auto"}}],
     "timestamp_micros":"1467374617058000",
     "previous_timestamp_micros":"1467191135684000"}, ...]

What's the meaning of the key previous_timestamp_micros? Is it the timestamp of the previous session_start of the same user? Or is it the timestamp of a previous event of the same user? I've checked the data, it seems both guesses are incorrect.

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1 回答 1

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以下来自 event_dim 架构 

timestamp_micros            INTEGER     The timestamp (in microseconds) at which this  
                                        event was logged.   
previous_timestamp_micros   INTEGER     The timestamp (in microseconds) at which this  
                                        event was previously logged.

在此处查看更多详细信息

于 2016-07-08T03:20:19.950 回答