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_r273507782
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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 {
+ override def convert(v: UTF8String): UTF8String = if (v.numBytes() == 0)
null else v
+ override def doGenCode(ctx: CodegenContext, ev: ExprCode): ExprCode = {
+ nullSafeCodeGen(ctx, ev, c => {
+ val setIsNull = if (nullable) s"${ev.isNull} = true" else ""
Review comment:
this is not needed, if nullable is always true.
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