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Diffstat (limited to 'src/arrow/r/man/Expression.Rd')
-rw-r--r-- | src/arrow/r/man/Expression.Rd | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/src/arrow/r/man/Expression.Rd b/src/arrow/r/man/Expression.Rd new file mode 100644 index 000000000..58a6a44c0 --- /dev/null +++ b/src/arrow/r/man/Expression.Rd @@ -0,0 +1,18 @@ +% Generated by roxygen2: do not edit by hand +% Please edit documentation in R/expression.R +\name{Expression} +\alias{Expression} +\title{Arrow expressions} +\description{ +\code{Expression}s are used to define filter logic for passing to a \link{Dataset} +\link{Scanner}. + +\code{Expression$scalar(x)} constructs an \code{Expression} which always evaluates to +the provided scalar (length-1) R value. + +\code{Expression$field_ref(name)} is used to construct an \code{Expression} which +evaluates to the named column in the \code{Dataset} against which it is evaluated. + +\code{Expression$create(function_name, ..., options)} builds a function-call +\code{Expression} containing one or more \code{Expression}s. +} |