vrajat commented on code in PR #15773:
URL: https://github.com/apache/pinot/pull/15773#discussion_r2099928609


##########
pinot-query-planner/src/main/java/org/apache/pinot/query/planner/physical/DispatchablePlanMetadata.java:
##########
@@ -80,6 +81,24 @@ public class DispatchablePlanMetadata implements 
Serializable {
   // Map from workerId -> {planFragmentId -> mailboxes}
   private final Map<Integer, Map<Integer, MailboxInfos>> 
_workerIdToMailboxesMap = new HashMap<>();
 
+  /**
+   * Map from workerId -> {tableType -> {tableName -> segments}} is required 
for logical tables.
+   * Raw definition of the map is:
+   * Map<String, Map<String, Map<String, List<String>>>>. Since this 
definition is hard to understand - specifically
+   * what do each of the string keys store, we define two classes:
+   * {@link TableTypeToSegmentsMap} and {@link 
TableTypeTableNameToSegmentsMap} to help read code more easily.
+   */
+  public static class TableTypeToSegmentsMap {

Review Comment:
   Doh! - Simplified the data structure to `Map<String, List<String>>`. I 
realised that the data structure has physical table name AND table type. So now 
it is a map of `physicalTableName -> segments`. 
   
   I did this AFTER spending a lot of time thinking about jackson map 
serialization and other related issues. 



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