has_index: Check whether a .vtr column has a usable hash index

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

Check whether a .vtr column has a usable hash index

Description

TRUE when the .vtri sidecar is present, in the current format, and built against the store as it now stands. An index that no longer matches the store reads as FALSE, because queries ignore it; create_index() rebuilds it.

Usage

has_index(path, column)

Arguments

path	Path to a .vtr file.
column	Character vector. Name(s) of column(s), in any order.

Value

Logical scalar: TRUE if the index exists and can be used.

Examples

f <- tempfile(fileext = ".vtr")
write_vtr(data.frame(id = letters, val = 1:26, stringsAsFactors = FALSE), f)
has_index(f, "id")   # FALSE
create_index(f, "id")
has_index(f, "id")   # TRUE
unlink(c(f, paste0(f, ".id.vtri")))

vectra documentation built on July 31, 2026, 1:07 a.m.