Github user dongjoon-hyun commented on the issue:
https://github.com/apache/spark/pull/13930
Yep. Right.
The following is the situation here.
0. There was a Hive function: `double f()`.
1. Spark Analyzer makes a Hive function expression whose return type is
`DecimalType`.
2. Hive Analyzer raises exception because there is not such a function,
`Decimal f()`.
3. In this PR, it makes a Hive function expression whose return type is
`double` and retry.
This was the story of this PR at that time.
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