[GitHub] [spark] cloud-fan commented on a change in pull request #23010: [SPARK-26012][SQL]Null and '' values should not cause dynamic partition failure of string types

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cloud-fan commented on a change in pull request #23010: [SPARK-26012][SQL]Null and '' values should not cause dynamic partition failure of string types
URL: https://github.com/apache/spark/pull/23010#discussion_r273507545
 
 

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 File path: sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/DataSourceStrategy.scala
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 @@ -260,6 +261,75 @@ class FindDataSourceTable(sparkSession: SparkSession) extends Rule[LogicalPlan]
   }
 }
 
+/** A function that converts the empty string to null for partition values. */
+case class Empty2Null(child: Expression) extends UnaryExpression with String2StringExpression {
 
 Review comment:
   we should override `nullable` in this expression, to always return true.

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