Github user HyukjinKwon commented on the issue:
https://github.com/apache/spark/pull/15609
@priyankagargnitk Could I please ask some codes which I can reproduce this
issue? It seems fine the sql below:
```sql
spark-sql> SELECT if(true, cast('2014-01-01' as date), cast('2014-12-12' as
timestamp));
2014-01-01 00:00:00
```
I just checked and it seems this is covered in
[TypeCoercion.scala#L596-L601](https://github.com/apache/spark/blob/39e2bad6a866d27c3ca594d15e574a1da3ee84cc/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/TypeCoercion.scala#L596-L601).
It seems the cases here are unreachable to end users.
Also, it seems it can't just cast it. For example, if we add a test with
`IntegerType` and `StringType` here, i guess it'd be failed due to the cast.
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