mihaibudiu commented on code in PR #4587:
URL: https://github.com/apache/calcite/pull/4587#discussion_r2449091934


##########
core/src/test/resources/sql/hep.iq:
##########
@@ -38,11 +38,11 @@
 # 5. Duplicate operations on the same rule: last operation wins
 #    Example: "+Rule1,+Rule1,-Rule1" results in rule being removed
 # 6. Execution order:
-#      [HEP Program] (HepPlanner, configurable rules)
+#      [HEP Program] (HepPlanner, configurable CoreRules.* rules)
 #            ↓
-#      [Volcano Program] (VolcanoPlanner, configurable rules)
+#      [Volcano Program] (VolcanoPlanner, configurable EnumerableRules.* rules)
 #            ↓
-#      [Calc Program] (HepPlanner, fixed rules)
+#      [Calc Program] (HepPlanner, fixed RelOptRules.CALC_RULES)

Review Comment:
   I am talking about what the comment documents.
   What does `[Calc Program] (HepPlanner, fixed RelOptRules.CALC_RULES)` mean?
   It seems to me that it says that there is a program executed by the 
HepPlanner which is initially seeded with the CALC_RULES.
   If this is correct, you should say it explicitly in English. 



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