Github user HyukjinKwon commented on the issue:
https://github.com/apache/spark/pull/16777
@cloud-fan, To cut this short, it seems Postgres supports this whereas Hive
does not.
It seems we now support implicit cast between`ArrayType`s via
[SPARK-18624](https://issues.apache.org/jira/browse/SPARK-18624), for example
as below:
```scala
sql("SELECT percentile_approx(10.0, array('1', '1', '1'), 100)").show()
```
Wouldn't it be more reasonable to allow this case?
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