Github user yu-iskw commented on the pull request:
https://github.com/apache/spark/pull/9525#issuecomment-154508219
I think it would be natural to fix the Scala error message and fix the
condition in Python. The algorithm checks not the indexes have duplicated
values, but the indexes are sorted.
@srowen What do you think?
## Python
Replace `>=` with `>`.
```
if self.indices[i] > self.indices[i + 1]:
raise TypeError("indices array must be sorted")
```
## Scala
Change the message.
```
require(prev < i, s"indices array must be sorted: $i.")
```
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