[GitHub] [spark] dtenedor commented on a diff in pull request #36771: [SPARK-39383][SQL] Support DEFAULT columns in ALTER TABLE ADD COLUMNS to V2 data sources

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

dtenedor commented on code in PR #36771:
URL: https://github.com/apache/spark/pull/36771#discussion_r894798568


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sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/util/ResolveDefaultColumnsUtil.scala:
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@@ -95,7 +95,7 @@ object ResolveDefaultColumns {
     if (SQLConf.get.enableDefaultColumns) {
       val allowedTableProviders: Array[String] =
         SQLConf.get.getConf(SQLConf.DEFAULT_COLUMN_ALLOWED_PROVIDERS)
-          .toLowerCase().split(",").map(_.trim)
+          .toLowerCase().split(",").map(_.trim) ++ Seq("")

Review Comment:
   Good question: we include the empty string here to allow the 'tableProvider' argument to be empty. This is only empty in tests, for example when using the InMemoryTableCatalog. In all other cases, the code requires a non-empty table provider to be given to this method call. I added this information to a comment here to help explain.
   



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