jiaan.geng created SPARK-31393:
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Summary: Show the correct alias in a more elegant way
Key: SPARK-31393
URL: https://issues.apache.org/jira/browse/SPARK-31393
Project: Spark
Issue Type: Improvement
Components: SQL
Affects Versions: 3.1.0
Reporter: jiaan.geng
Spark SQL exists some function no elegant implementation alias.
For example: BitwiseCount override the sql method
override def sql: String = s"bit_count(${child.sql})"
I don't think it's elegant enough.
Because `Expression` gives the following definitions.
```
def sql: String = {
val childrenSQL = children.map(_.sql).mkString(", ")
s"$prettyName($childrenSQL)"
}
```
By this definition, BitwiseCount should override `prettyName` method.
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