getColumn() function
getColumn() extracts a specified column from a table as an array.
If the specified column is not present in the table, the function returns an error.
Function type signature
(<-table: stream[A], column: string) => [B] where A: Record
For more information, see Function type signatures.
Parameters
column
(Required) Column to extract.
table
Input table. Default is piped-forward data (<-).
Examples
- Extract an array of column values from a table
- Extract an array of column values and display them in a table
Extract an array of column values from a table
import "sampledata"
sampledata.int()
|> tableFind(fn: (key) => key.tag == "t1")
|> getColumn(column: "_value")// Returns [-2, 10, 7, 17, 15, 4]
Extract an array of column values and display them in a table
import "array"
import "sampledata"
columnData =
sampledata.int()
|> tableFind(fn: (key) => key.tag == "t1")
|> getColumn(column: "_value")
array.from(rows: [{_value: display(v: columnData)}])
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