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## get_duration function

The `get_duration` function converts the given number of milliseconds to a duration string. The result type is `STRING`.

Syntax:

    STRING get_duration(LONG duration_millis)

Semantics:

- duration_millis: the duration in milliseconds.
- Return Value: STRING. The returned duration string format is [-](<n> <UNIT>)+, where the <UNIT> can be DAY, HOUR, MINUTE, SECOND and MILLISECOND, e.g. "1 day 2 hours" or "-10 minutes 0 second 500 milliseconds".

Example 12-12 What is the duration in days, hours, or minutes between the time the baggage was boarded at one leg and reached the next leg for the passenger with ticket number 1762355527825?

    SELECT $s.ticketno, $bagInfo.bagArrivalDate, $flightLeg.flightDate,
          get_duration(timestamp_diff($bagInfo.bagArrivalDate, $flightLeg.flightDate)) AS diff FROM
          baggageinfo $s, $s.bagInfo[] AS $bagInfo, $bagInfo.flightLegs[] AS $flightLeg WHERE
          ticketNo=1762355527825;

Explanation: In an airline application every customer can have different number of hops/legs between their source and destination. In this query, you determine the time taken between every flight leg. This is determined by the difference between `bagArrivalDate` and `flightDate` for every flight leg.

The `bagArrivalDate` and `flightDate` is in an unsupported format for the `get_duration` function, so wrap it in the timestamp_diff function to make it valid.

Output:

    {"bagArrivalDate":"2019-03-22T10:17:00Z","flightDate":"2019-03-22T07:00:00Z","diff":"3 hours 17 minutes"}
    {"bagArrivalDate":"2019-03-22T10:17:00Z","flightDate":"2019-03-22T07:23:00Z","diff":"2 hours 54 minutes"}
    {"bagArrivalDate":"2019-03-22T10:17:00Z","flightDate":"2019-03-22T08:23:00Z","diff":"1 hour 54 minutes"}

Example 12-13 How long does it take in days, hours, or minutes from the time of check-in to when the bag is scanned at the point of boarding for the passenger with ticket number 176234463813?

    SELECT $flightLeg.flightNo, $flightLeg.actions[contains($element.actionCode,
          "Checkin")].actionTime AS checkinTime, $flightLeg.actions[contains($element.actionCode,
          "BagTag Scan")].actionTime AS bagScanTime, get_duration(timestamp_diff(
          $flightLeg.actions[contains($element.actionCode, "Checkin")].actionTime,
          $flightLeg.actions[contains($element.actionCode, "BagTag Scan")].actionTime )) AS diff FROM
          baggageinfo $s,  $s.bagInfo[].flightLegs[] AS $flightLeg WHERE ticketNo=176234463813  AND
          starts_with($s.bagInfo[].routing, $flightLeg.fltRouteSrc)

Explanation: In the baggage data, every `flightLeg` has an `actions` array. There are three different actions in the `actions` array. The action code for the first element in the array is `Checkin/Offload`. For the first leg, the action code is `Checkin` and for the other legs, the action code is `Offload at the hop`. The action code for the second element of the array is `BagTag Scan`. In the query above, you determine the difference in action time between the bag tag scan and check-in time. You use the `contains` function to filter the action time only if the action code is Checkin or BagScan. Since only the first flight leg has details of check-in and bag scan, you additionally filter the data using `starts_with` function to fetch only the source code `fltRouteSrc`.

The input values for the `get_durration` function is in an unsupported format, so pass it in the timestamp_diff function to make it valid.

Output:

    {"flightNo":"BM572","checkinTime":"2019-03-02T03:28:00Z",
    "bagScanTime":"2019-03-02T04:52:00Z","diff":"- 1 hour 24 minutes"}

Example 12-14 How long does it take in days, hours, or minutes for the baggage of a customer with ticket no 1762320369957 to reach the first transit point?

    SELECT  $bagInfo.flightLegs[1].actions[2].actionTime,
    $bagInfo.flightLegs[0].actions[0].actionTime,
    get_duration(timestamp_diff($bagInfo.flightLegs[1].actions[2].actionTime,
    $bagInfo.flightLegs[0].actions[0].actionTime)) AS diff FROM baggageinfo $s, $s.bagInfo[] as $bagInfo
    WHERE ticketNo=1762320369957;

Explanation: In an airline application every customer can have different number of hops/legs between their source and destination. In the example above, you determine the time taken for the bag to reach the first transit point. In the baggage data, the `flightLeg` is an array. The first record in the array refers to the first transit point details. The `flightDate` in the first record is the time when the bag leaves the source and the `estimatedArrival` in the first flight leg record indicates the time it reaches the first transit point. The difference between the two gives the time taken for the bag to reach the first transit point.

The input values for the `get_durration` function is in an unsupported format, so pass it in the timestamp_diff function to make it valid.

Output:

    {"flightDate":"2019-03-12T03:00:00Z","estimatedArrival":"2019-03-12T16:00:00Z","diff":"13 hours"}
    {"flightDate":"2019-03-12T03:00:00Z","estimatedArrival":"2019-03-12T16:40:00Z","diff":"13 hours 40 minutes"}