Github user felixcheung commented on the issue:
https://github.com/apache/spark/pull/16739
@gatorsmile thanks for commenting. `coalesce` currently accept a number
even if it is larger than the current number of partitions - I guess we didn't
want to throw exeception in that case?
but, since you are here, do you know why we see this behavior
```
df2 <- repartition(df1, 10)
expect_equal(getNumPartitions(df2), 10) <-- right after repartition the
number of partition is greater than the original numSlices
expect_equal(getNumPartitions(coalesce(df2, 13)), 5) <-- but coalesce after
repartition it can't go beyond 5
```
Shouldn't I allow to set partition to 5 < n < 10, since I just
`repartition(10)`?
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