Adding upstream version 18.2.2.upstream/18.2.2

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 49 insertions, 0 deletions

diff --git a/src/arrow/r/man/ParquetWriterProperties.Rd b/src/arrow/r/man/ParquetWriterProperties.Rd
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+++ b/src/arrow/r/man/ParquetWriterProperties.Rd
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+% Generated by roxygen2: do not edit by hand
+% Please edit documentation in R/parquet.R
+\docType{class}
+\name{ParquetWriterProperties}
+\alias{ParquetWriterProperties}
+\title{ParquetWriterProperties class}
+\description{
+This class holds settings to control how a Parquet file is read
+by \link{ParquetFileWriter}.
+}
+\details{
+The parameters \code{compression}, \code{compression_level}, \code{use_dictionary}
+and write_statistics` support various patterns:
+\itemize{
+\item The default \code{NULL} leaves the parameter unspecified, and the C++ library
+uses an appropriate default for each column (defaults listed above)
+\item A single, unnamed, value (e.g. a single string for \code{compression}) applies to all columns
+\item An unnamed vector, of the same size as the number of columns, to specify a
+value for each column, in positional order
+\item A named vector, to specify the value for the named columns, the default
+value for the setting is used when not supplied
+}
+
+Unlike the high-level \link{write_parquet}, \code{ParquetWriterProperties} arguments
+use the C++ defaults. Currently this means "uncompressed" rather than
+"snappy" for the \code{compression} argument.
+}
+\section{Factory}{
+
+
+The \code{ParquetWriterProperties$create()} factory method instantiates the object
+and takes the following arguments:
+\itemize{
+\item \code{table}: table to write (required)
+\item \code{version}: Parquet version, "1.0" or "2.0". Default "1.0"
+\item \code{compression}: Compression type, algorithm \code{"uncompressed"}
+\item \code{compression_level}: Compression level; meaning depends on compression algorithm
+\item \code{use_dictionary}: Specify if we should use dictionary encoding. Default \code{TRUE}
+\item \code{write_statistics}: Specify if we should write statistics. Default \code{TRUE}
+\item \code{data_page_size}: Set a target threshold for the approximate encoded
+size of data pages within a column chunk (in bytes). Default 1 MiB.
+}
+}
+
+\seealso{
+\link{write_parquet}
+
+\link{Schema} for information about schemas and metadata handling.
+}