Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/19874#discussion_r154855820
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/DecimalPrecision.scala
---
@@ -58,7 +58,7 @@ import org.apache.spark.sql.types._
* - FLOAT and DOUBLE cause fixed-length decimals to turn into DOUBLE
*/
// scalastyle:on
-object DecimalPrecision extends Rule[LogicalPlan] {
+object DecimalPrecision extends Rule[LogicalPlan] with TypePropagation {
--- End diff --
one benefit of naming it `TypeCoercionRule` is, we can just do `object
DecimalPrecision extends TypeCoercionRule`
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