hackergin commented on code in PR #24183:
URL: https://github.com/apache/flink/pull/24183#discussion_r1468992167


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flink-table/flink-table-planner/src/main/scala/org/apache/flink/table/planner/codegen/calls/StringCallGen.scala:
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@@ -237,6 +238,9 @@ object StringCallGen {
         val currentDatabase = ctx.addReusableQueryLevelCurrentDatabase()
         generateNonNullField(returnType, currentDatabase)
 
+      case DEFAULT =>

Review Comment:
   The default function is not registered, it is only used for codegen judgment.



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