ulysses-you commented on code in PR #39475:
URL: https://github.com/apache/spark/pull/39475#discussion_r1065329544
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sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/V1Writes.scala:
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@@ -91,32 +92,31 @@ object V1Writes extends Rule[LogicalPlan] with
SQLConfHelper {
}
private def prepareQuery(write: V1WriteCommand, query: LogicalPlan):
LogicalPlan = {
- val hasEmpty2Null = query.exists(p => hasEmptyToNull(p.expressions))
- val empty2NullPlan = if (hasEmpty2Null) {
- query
- } else {
- val projectList = convertEmptyToNull(query.output,
write.partitionColumns)
- if (projectList.isEmpty) query else Project(projectList, query)
- }
+ val projectList = convertEmptyToNull(query.output, write.partitionColumns)
+ val empty2NullPlan = if (projectList.isEmpty) query else
Project(projectList, query)
assert(empty2NullPlan.output.length == query.output.length)
val attrMap = AttributeMap(query.output.zip(empty2NullPlan.output))
-
- // Rewrite the attribute references in the required ordering to use the
new output.
- val requiredOrdering = write.requiredOrdering.map(_.transform {
- case a: Attribute => attrMap.getOrElse(a, a)
- }.asInstanceOf[SortOrder])
+ // `Empty2Null` does not affect ordering. The required sort ordering
direction is `Ascending`
+ // and the null ordering is `NullsFirst`. Both empty and null value are at
the top of rows.
+ // Here we use the original required ordering to compare if matches so
that we can preserve the
+ // user-specified sort ordering with such case:
+ // `INSERT INTO TABLE t PARTITION(p) SELECT c, p FROM t SORT BY p, c`.
+ val requiredOrdering = write.requiredOrdering
Review Comment:
this is the key change that use the original required ordering before
pulling out `Empty2Null`
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