beliefer commented on a change in pull request #28154: [SPARK-31372][SQL] Check
the validity of built-in function aliases
URL: https://github.com/apache/spark/pull/28154#discussion_r405920818
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/FunctionRegistry.scala
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@@ -529,7 +529,7 @@ object FunctionRegistry {
expression[BitwiseNot]("~"),
expression[BitwiseOr]("|"),
expression[BitwiseXor]("^"),
- expression[BitwiseCount]("bit_count"),
+ expression[BitwiseCount]("bit_count", true),
Review comment:
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, I judge legitimacy by comparing `prettyName` with alias.
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