HyukjinKwon commented on a change in pull request #22954: [SPARK-25981][R]
Enables Arrow optimization from R DataFrame to Spark DataFrame
URL: https://github.com/apache/spark/pull/22954#discussion_r250618871
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File path: R/pkg/R/SQLContext.R
##########
@@ -147,6 +147,73 @@ getDefaultSqlSource <- function() {
l[["spark.sql.sources.default"]]
}
+writeToFileInArrow <- function(fileName, rdf, numPartitions) {
+ requireNamespace1 <- requireNamespace
+
+ # R API in Arrow is not yet released in CRAN. CRAN requires to add the
+ # package in requireNamespace at DESCRIPTION. Later, CRAN checks if the
package is available
+ # or not. Therefore, it works around by avoiding direct requireNamespace.
+ # Currently, as of Arrow 0.12.0, it can be installed by install_github. See
ARROW-3204.
+ if (requireNamespace1("arrow", quietly = TRUE)) {
Review comment:
Assuming from ARROW-3204, Arrow is still not in the CRAN and looks it's
going to take few months, and looks we can run the build via AppVeyor when it's
on CRAN.
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