rename() function
rename()
renames columns in a table.
If a column in the group key is renamed, the column name in the group key is updated.
Function type signature
(<-tables: stream[B], ?columns: A, ?fn: (column: string) => string) => stream[C] where A: Record, B: Record, C: Record
Parameters
columns
Record that maps old column names to new column names.
fn
Function that takes the current column name (column
) and returns a
new column name.
tables
Input data. Default is piped-forward data (<-
).
Examples
- Explicitly map column names to new column names
- Rename columns using a function
- Conditionally rename columns using a function
Explicitly map column names to new column names
import "sampledata"
sampledata.int()
|> rename(columns: {tag: "uid", _value: "val"})
Rename columns using a function
import "sampledata"
sampledata.int()
|> rename(fn: (column) => "${column}_new")
Conditionally rename columns using a function
import "sampledata"
sampledata.int()
|> rename(
fn: (column) => {
_newColumnName = if column =~ /^_/ then "${column} (Reserved)" else column
return _newColumnName
},
)
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