szehon-ho commented on code in PR #53229:
URL: https://github.com/apache/spark/pull/53229#discussion_r2566111846


##########
sql/catalyst/src/main/scala/org/apache/spark/sql/internal/SQLConf.scala:
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@@ -7903,8 +7903,8 @@ class SQLConf extends Serializable with Logging with 
SqlApiConf {
   def legacyXMLParserEnabled: Boolean =
     getConf(SQLConf.LEGACY_XML_PARSER_ENABLED)
 
-  def coerceMergeNestedTypes: Boolean =
-    getConf(SQLConf.MERGE_INTO_NESTED_TYPE_COERCION_ENABLED)
+  // Disable until we define the semantics of UPDATE SET * with nested types
+  def coerceMergeNestedTypes: Boolean = false

Review Comment:
   sure, that'd be great



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