mutate: Add or transform columns

In vectra: Columnar Query Engine for Larger-than-RAM Data

Add or transform columns

Description

Add or transform columns

Usage

mutate(.data, ...)

Arguments

.data	A vectra_node object.
...	Named expressions for new or transformed columns.

Details

Supported expression types: arithmetic (+, -, *, /, %%), comparison, boolean, is.na(), nchar(), substr(), grepl() (fixed match only). Window functions (row_number(), rank(), dense_rank(), lag(), lead(), cumsum(), cummean(), cummin(), cummax()) are detected automatically and routed to a dedicated window node.

When grouped, window functions respect partition boundaries.

This is a streaming operation for regular expressions; window functions materialize all rows within each partition.

Value

A new vectra_node with mutated columns.

Examples

f <- tempfile(fileext = ".vtr")
write_vtr(mtcars, f)
tbl(f) |> mutate(kpl = mpg * 0.425144) |> collect() |> head()
unlink(f)

vectra documentation built on May 8, 2026, 9:06 a.m.