Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/19874#discussion_r154853773
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/TypeCoercion.scala
---
@@ -850,3 +834,45 @@ object TypeCoercion {
}
}
}
+
+trait TypePropagation extends Logging {
--- End diff --
how about
```
trait TypeCoercionRule extends Rule[LogicalPlan] {
protected def coerciveType(plan: LogicalPlan): LogicalPlan
def apply(plan: LogicalPlan): LogicalPlan = {
val newPlan = coerciveType(plan)
...
}
}
```
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