FIRST_EACH

Returns an array of first values in the time window, grouped by a sub-key.
The statement is limited to a maximum number of values.
Syntax
FIRST_EACH([MAX VALUES, ]GROUP, VALUE)
Arguments
MAX VALUES:  Limit of key\value elements in the output (Default: 2,147,483,647). 
                            When MAX VALUES is omitted, the limit is simply set to the default value. 
GROUP:             Field to aggregate by 
VALUE:             Field to sub-aggregate by
Returns
For each key aggregated in the query, the function returns an array or FIRST values of key\value pairs.
Notes
This function is non-deterministic.
AVAILABLE IN
Output Type                   Availablity 
Aggregated Outputs     NO 
Explicit Lookup Table   YES 
Inline Joins\Lookups     NO
Example
Data 
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[
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   {
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      "GROUP_ID":"G1",
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      "USER_ID":"U1",
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      "CONNECTION_TIME":"2020-06-26 02:31:29,573"
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   },
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   {
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      "GROUP_ID":"G1",
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      "USER_ID":"U2",
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      "CONNECTION_TIME":"2020-06-26 18:11:45,783"
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   },
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   {
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      "GROUP_ID":"G2",
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      "USER_ID":"Z1",
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      "CONNECTION_TIME":"2020-06-26 23:54:27,687"
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   },
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   {
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      "GROUP_ID":"G2",
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      "CONNECTION_TIME":"2020-07-26 23:54:27,687"
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   },
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   {
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      "GROUP_ID":"G1",
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      "USER_ID":"U2",
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      "CONNECTION_TIME":"2021-07-01 02:31:29,573"
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   },
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   {
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      "GROUP_ID":"G1",
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      "USER_ID":"U1",
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      "CONNECTION_TIME":"2021-07-01 18:11:45,783"
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   },
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   {
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      "GROUP_ID":"G2",
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      "USER_ID":"Z1",
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      "CONNECTION_TIME":"2021-07-01 23:54:27,687"
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   }
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]
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Query:
For each GROUP, find when the each USER first appeared.
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SELECT
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   data.GROUP_ID AS group_id:STRING,
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   FIRST_EACH(data.USER_ID, data.CONNECTION_TIME) AS first_each_data_user_id__data_connection_time 
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FROM
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   "SAMPLE_DATA_G1U1 - json" 
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GROUP BY
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   data.GROUP_ID
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Results:
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{
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   "group_id":"G2",
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   "first_each_data_user_id__data_connection_time":[
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      {
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         "value":"2020-06-26 23:54:27,687",
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         "key":"Z1"
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      }
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   ]
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}{
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   "group_id":"G1",
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   "first_each_data_user_id__data_connection_time":[
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      {
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         "value":"2020-06-26 02:31:29,573",
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         "key":"U1"
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      },
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      {
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         "value":"2020-06-26 18:11:45,783",
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         "key":"U2"
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      }
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   ]
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}
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Related Functions
​FIRST
FIRST_ARRAY
FIRST_TIME_SERIES​
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FIRST_ARRAY

FIRST_TIME_SERIES

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