Computes the rolling list of values forward or backward of the current row within the specified column and returns an array of these values. |
The row from which to extract a value is determined by the order in which the rows are organized based on the order
parameter.
If you are working on a randomly generated sample of your dataset, the values that you see for this function might not correspond to the values that are generated on the full dataset during job execution.
1000
values. To change the maximum number of values, specify a value for the limit
parameter.-1
and 0
, which computes the rolling function from the current row back to the first row of the dataset.For more information on a non-rolling version of this function, see LIST Function.
Column example:
rollinglist(myCol) |
Output: Returns the rolling list of values in the myCol
column from the first row of the dataset to the current one.
Rows before example:
rollinglist(myNumber, 5, 20) |
Output: Returns the rolling list of values of the current row and the twenty previous row values in the myNumber
column, with a limit of 5 total values.
Rows before and after example:
rollinglist(myNumber, 20, 299, 200) |
Output: Returns the rolling list of values from the previous 299 rows, the current row value, and the 200 rows after the current one in the myNumber
column, with a limit of 20 total values.
rollinglist(col_ref, rowsBefore_integer, rowsAfter_integer) order: order_col [group: group_col] |
Argument | Required? | Data Type | Description |
---|---|---|---|
col_ref | Y | string | Name of column whose values are applied to the function |
limit_int | N | integer | Maximum number of values to extract into the list array. From 1 to 1000 . |
rowsBefore_integer | N | integer | Number of rows before the current one to include in the computation |
rowsAfter_integer | N | integer | Number of rows after the current one to include in the computation |
For more information on the order
and group
parameters, see Window Transform.
Name of the column whose values are used to compute the function.
Required? | Data Type | Example Value |
---|---|---|
Yes | String (column reference to Integer or Decimal values) | myColumn |
Non-negative integer that defines the maximum number of values to extract into the list array.
NOTE: If specified, this value must between 1 and 1000, inclusive. |
NOTE: Do not use the limiting argument in a |
Required? | Data Type | Example Value |
---|---|---|
No | Integer | 50 |
Integers representing the number of rows before or after the current one from which to compute the rolling function, including the current row. For example, if the first value is 5
, the current row and the four rows after it are used in the computation. Negative values for rowsAfter_integer
compute the rolling function from rows preceding the current one.
rowBefore=1
generates the current row value only.rowBefore=-1
uses all rows preceding the current one.rowsAfter
is not specified, then the value 0
is applied.group
parameter is applied, then these parameter values should be no more than the maximum number of rows in the groups.Required? | Data Type | Example Value |
---|---|---|
No | Integer | 4 |
The following dataset includes the finishing times for each boat in a race. As part of the race, each boat may be assigned one or more penalties in terms of seconds. So, the total time for the race is computed by adding two columns.
You are interested in the list of recent finishers by each finishing time.
Source:
id | pilotName | boatType | raceTime | racePenalties |
---|---|---|---|---|
1 | Schmidt | Sunfish | 4573.8 | 53 |
2 | Bolt | Laser | 4934.21 | 11 |
3 | Masters | Force 5 | 4446.89 | 70 |
4 | Jamison | Force 5 | 4355.79 | 31 |
5 | Williams | Sunfish | 4675.86 | 15 |
6 | Hobart | Laser | 5077.5 | 50 |
7 | Millingham | Laser | 4940.09 | 54 |
8 | Nelson | Force 5 | 5116.14 | 56 |
9 | Greene | Sunfish | 5105.94 | 5 |
10 | Danielson | Laser | 4964.03 | 18 |
11 | Cooper | Force 5 | 5281.55 | 13 |
12 | Stevens | Laser | 5176.35 | 0 |
13 | Young | Sunfish | 5038.11 | 16 |
14 | Thompson | Force 5 | 5252.9 | 62 |
15 | McDonald | Laser | 5052.24 | 20 |
16 | O'Roarke | Sunfish | 5080.76 | 45 |
17 | Collins | Sunfish | 5176.09 | 10 |
18 | Wright | Laser | 5391.61 | 34 |
19 | Black | Sunfish | 5023.32 | 32 |
20 | Bush | Force 5 | 5200.37 | 28 |
Transformation:
Compute the total time for each racer by summing the raceTime
column and the racePenalties
column:
You can then compute the list of recent finishers by boat type, automatically sorting the generated lists by the totalRaceTime
column:
Results:
id | pilotName | boatType | last5FinisherBoatTypes | raceTime | racePenalties | totalRaceTime |
---|---|---|---|---|---|---|
4 | Jamison | Force 5 | ["Force 5"] | 4355.79 | 31 | 4386.79 |
3 | Masters | Force 5 | ["Force 5","Force 5"] | 4446.89 | 70 | 4516.89 |
1 | Schmidt | Sunfish | ["Force 5","Force 5","Sunfish"] | 4573.8 | 53 | 4626.8 |
5 | Williams | Sunfish | ["Force 5","Force 5","Sunfish","Sunfish"] | 4675.86 | 15 | 4690.86 |
2 | Bolt | Laser | ["Force 5","Force 5","Sunfish","Sunfish","Laser"] | 4934.21 | 11 | 4945.21 |
10 | Danielson | Laser | ["Force 5","Sunfish","Sunfish","Laser","Laser"] | 4964.03 | 18 | 4982.03 |
7 | Millingham | Laser | ["Sunfish","Sunfish","Laser","Laser","Laser"] | 4940.09 | 54 | 4994.09 |
13 | Young | Sunfish | ["Sunfish","Laser","Laser","Laser","Sunfish"] | 5038.11 | 16 | 5054.11 |
19 | Black | Sunfish | ["Laser","Laser","Laser","Sunfish","Sunfish"] | 5023.32 | 32 | 5055.32 |
15 | McDonald | Laser | ["Laser","Laser","Sunfish","Sunfish","Laser"] | 5052.24 | 20 | 5072.24 |
9 | Greene | Sunfish | ["Laser","Sunfish","Sunfish","Laser","Sunfish"] | 5105.94 | 5 | 5110.94 |
16 | O'Roarke | Sunfish | ["Sunfish","Sunfish","Laser","Sunfish","Sunfish"] | 5080.76 | 45 | 5125.76 |
6 | Hobart | Laser | ["Sunfish","Laser","Sunfish","Sunfish","Laser"] | 5077.5 | 50 | 5127.5 |
8 | Nelson | Force 5 | ["Laser","Sunfish","Sunfish","Laser","Force 5"] | 5116.14 | 56 | 5172.14 |
12 | Stevens | Laser | ["Sunfish","Sunfish","Laser","Force 5","Laser"] | 5176.35 | 0 | 5176.35 |
17 | Collins | Sunfish | ["Sunfish","Laser","Force 5","Laser","Sunfish"] | 5176.09 | 10 | 5186.09 |
20 | Bush | Force 5 | ["Laser","Force 5","Laser","Sunfish","Force 5"] | 5200.37 | 28 | 5228.37 |
11 | Cooper | Force 5 | ["Force 5","Laser","Sunfish","Force 5","Force 5"] | 5281.55 | 13 | 5294.55 |
14 | Thompson | Force 5 | ["Laser","Sunfish","Force 5","Force 5","Force 5"] | 5252.9 | 62 | 5314.9 |
18 | Wright | Laser | ["Sunfish","Force 5","Force 5","Force 5","Laser"] | 5391.61 | 34 | 5425.61 |