alfozan commented on a change in pull request #25028: [SPARK-28227][SQL]
Support TRANSFORM with aggregation.
URL: https://github.com/apache/spark/pull/25028#discussion_r339890074
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/parser/AstBuilder.scala
##########
@@ -506,12 +511,71 @@ class AstBuilder(conf: SQLConf) extends
SqlBaseBaseVisitor[AnyRef] with Logging
AttributeReference("value", StringType)()), true)
}
+ val namedExpressions = expressions.map {
+ case e: NamedExpression => e
+ case e: Expression => UnresolvedAlias(e)
+ }
Review comment:
re discussion in
https://github.com/apache/spark/pull/25028#issuecomment-547230458 and
https://github.com/apache/spark/pull/25028#issuecomment-547246714
Alternative suggestion:
```
val aliasFunc = (position: Int, e: Expression) => s"gen_alias_${position}"
val namedExpressions = expressions.zipWithIndex.map {
case (e: NamedExpression, _) => e
case (e: Expression, index) => UnresolvedAlias(e,
Some(aliasFunc(index, _)))
}
```
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