pan3793 commented on code in PR #7029:
URL: https://github.com/apache/kyuubi/pull/7029#discussion_r2062385570


##########
kyuubi-server/src/main/scala/org/apache/kyuubi/server/metadata/jdbc/JdbcDatabaseDialect.scala:
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@@ -19,6 +19,10 @@ package org.apache.kyuubi.server.metadata.jdbc
 
 trait JdbcDatabaseDialect {
   def limitClause(limit: Int, offset: Int): String
+  def insertOrReplace(
+      table: String,
+      cols: Seq[String],
+      keyCol: String): Option[String] = None

Review Comment:
   can we have a default implementation instead of returning `Option[String]`? 
Or simply leave empty default implementation as all supported RDBMSs have 
dedicated dialects



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