maropu commented on a change in pull request #29587:
URL: https://github.com/apache/spark/pull/29587#discussion_r502844441
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/internal/SQLConf.scala
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@@ -2721,6 +2721,16 @@ object SQLConf {
.booleanConf
.createWithDefault(false)
+ val UNION_BYNAME_STRUCT_SUPPORT_ENABLED =
+ buildConf("spark.sql.unionByName.structSupport.enabled")
+ .doc("When true, the `allowMissingColumns` feature of
`Dataset.unionByName` supports " +
+ "nested column in struct types. Missing nested columns of struct
columns with same " +
+ "name will also be filled with null values. This currently does not
support nested " +
+ "columns in array and map types.")
Review comment:
> I believe it is not unable to adjust the nested columns to have a more
natural schema. But I can see this PR grows too big and I would like to cut it
early. If you are okay, I can address this issue in other PR after this. WDYT?
Yea, it looks okay to me. cc: @cloud-fan @HyukjinKwon @dongjoon-hyun
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