Github user felixcheung commented on a diff in the pull request:
https://github.com/apache/spark/pull/16512#discussion_r95518300
--- Diff: R/pkg/inst/tests/testthat/test_sparkSQL.R ---
@@ -196,6 +196,12 @@ test_that("create DataFrame from RDD", {
expect_equal(dtypes(df), list(c("name", "string"), c("age", "int"),
c("height", "float")))
expect_equal(as.list(collect(where(df, df$name == "John"))),
list(name = "John", age = 19L, height = 176.5))
+ expect_equal(getNumPartitions(toRDD(df)), 1)
--- End diff --
How about to add in doc:
"the actual number partition can be increased as multiples of
spark.r.maxAllocationLimit, or limited by the number of columns in data.frame."
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