keyValues() function
keyValues() returns a stream of tables with each input tables’ group key and
two columns, _key and _value, that correspond to unique column label and value
pairs for each input table.
Function type signature
(<-tables: stream[A], ?keyColumns: [string]) => stream[{B with _value: C, _key: string}] where A: Record, B: Record
For more information, see Function type signatures.
Parameters
keyColumns
List of columns from which values are extracted.
All columns must be of the same type.
Each input table must have all of the columns in the keyColumns parameter.
tables
Input data. Default is piped-forward data (<-).
Examples
Get key values from explicitly defined columns
data
|> keyValues(keyColumns: ["sensorID", "_field"])
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