alex-plekhanov commented on a change in pull request #9751:
URL: https://github.com/apache/ignite/pull/9751#discussion_r792593575



##########
File path: 
modules/calcite/src/main/java/org/apache/ignite/internal/processors/query/calcite/metadata/ColocationGroup.java
##########
@@ -47,12 +49,7 @@
 /** */
 public class ColocationGroup implements MarshalableMessage {
     /** */
-    private static final int SYNTHETIC_PARTITIONS_COUNT =
-        
IgniteSystemProperties.getInteger("IGNITE_CALCITE_SYNTHETIC_PARTITIONS_COUNT", 
512);
-
-    /** */
-    @GridDirectCollection(Long.class)
-    private List<Long> sourceIds;
+    private long[] sourceIds;

Review comment:
       What for? The regular array covers all needs and it's faster to send an 
array than an array wrapped into `Message`.




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