aokolnychyi commented on code in PR #51002:
URL: https://github.com/apache/spark/pull/51002#discussion_r2105479171
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sql/api/src/main/scala/org/apache/spark/sql/types/Metadata.scala:
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@@ -40,11 +40,13 @@ import org.apache.spark.util.ArrayImplicits._
* @since 1.3.0
*/
@Stable
-sealed class Metadata private[types] (private[types] val map: Map[String, Any])
+sealed class Metadata private[types] (
+ private[types] val map: Map[String, Any],
+ @transient private[types] val runtimeMap: Map[String, Any])
Review Comment:
Below is an example of how it is being used:
```
val existsDefault = extractExistsDefault(default)
val (sql, expr) = extractCurrentDefault(default)
val newMetadata = new MetadataBuilder()
.withMetadata(f.metadata)
.putString(EXISTS_DEFAULT_COLUMN_METADATA_KEY, existsDefault)
.putExpression(CURRENT_DEFAULT_COLUMN_METADATA_KEY, sql, expr)
.build()
f.copy(metadata = newMetadata)
```
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