kfaraz commented on code in PR #18547:
URL: https://github.com/apache/druid/pull/18547#discussion_r2374792405
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sql/src/main/java/org/apache/druid/sql/calcite/schema/SystemSchema.java:
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@@ -180,6 +180,7 @@ public class SystemSchema extends AbstractSchema
.add("max_size", ColumnType.LONG)
.add("is_leader", ColumnType.LONG)
.add("start_time", ColumnType.STRING)
+ .add("labels", ColumnType.NESTED_DATA)
Review Comment:
> If we're going to optimize the serialization in future, my suggestion is
to cache the serialized value in the DruidNode.
Yeah, I suppose that is possible by passing a `@JacksonInject ObjectMapper`
into the `DruidNode` constructor.
But it really seems unnecessary at this point.
Since serializing a small map is not a costly operation, we need not worry
about that optimization right now.
I should think that there are many more costlier serialization steps
involved in a single `SELECT * FROM sys.servers` query.
If the labels map becomes large, then we have other problems as mentioned
before anyway.
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