jon-wei commented on a change in pull request #8566: Upgrade Calcite to 1.21
URL: https://github.com/apache/incubator-druid/pull/8566#discussion_r348862757
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File path:
sql/src/main/java/org/apache/druid/sql/calcite/planner/DruidPlanner.java
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@@ -232,6 +242,45 @@ public void cleanup(EnumeratorIterator iterFromMake)
}
}
+ /**
+ * This method wraps the root with a logical sort that applies a limit (no
ordering change).
+ * The CTX_SQL_OUTER_LIMIT flag that controls this wrapping is meant for
internal use only by the
+ * web console, allowing it to apply a limit to queries without rewriting
the original SQL.
+ *
+ * @param root root node
+ * @return root node wrapped with a limiting logical sort if a limit is
specified in the query context.
+ */
+ @Nullable
+ private RelNode possiblyWrapRootWithOuterLimitFromContext(
+ RelRoot root
+ )
+ {
+ Object outerLimitObj =
plannerContext.getQueryContext().get(PlannerContext.CTX_SQL_OUTER_LIMIT);
+ if (outerLimitObj == null) {
+ return root.rel;
+ }
+ Long outerLimit = DimensionHandlerUtils.convertObjectToLong(outerLimitObj,
true);
Review comment:
Collapsed the two calls
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