[GitHub] [spark] HyukjinKwon commented on a change in pull request #28996: [SPARK-29358][SQL] Make unionByName optionally fill missing columns with nulls

[GitBox <gi...@apache.org>]

HyukjinKwon commented on a change in pull request #28996:
URL: https://github.com/apache/spark/pull/28996#discussion_r452068789



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File path: sql/catalyst/src/main/scala/org/apache/spark/sql/internal/SQLConf.scala
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@@ -2656,6 +2656,14 @@ object SQLConf {
       .checkValue(_ > 0, "The difference must be positive.")
       .createWithDefault(4)
 
+  val ALLOW_MISSING_COLUMNS_IN_UNION_BY_NAME =
+    buildConf("spark.sql.allowMissingColumnsInUnionByName")
+    .doc("If this config is enabled, `Dataset.unionByName` allows different set of column names " +
+      "between two Datasets. Missing columns at each side, will be filled with null values.")

Review comment:
       +1 for overloading.




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