Github user felixcheung commented on the issue:
https://github.com/apache/spark/pull/16739
hmm, not as far as I can see:
```
> df2 <- repartition(df1, 10)
> getNumPartitions(df2) # right after repartition the number of partition
is greater than the original numSlices
[1] 10
> foo <- coalesce(df2, 13)
> explain(foo, extended = T)
== Parsed Logical Plan ==
Repartition 13, false
+- Repartition 10, true
+- Repartition 3, false
+- LogicalRDD [speed#2, dist#3]
== Analyzed Logical Plan ==
speed: double, dist: double
Repartition 13, false
+- Repartition 10, true
+- Repartition 3, false
+- LogicalRDD [speed#2, dist#3]
== Optimized Logical Plan ==
Repartition 13, false
+- LogicalRDD [speed#2, dist#3]
== Physical Plan ==
Coalesce 13
+- Scan ExistingRDD[speed#2,dist#3]
```
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