abhishekagarwal87 commented on a change in pull request #11908:
URL: https://github.com/apache/druid/pull/11908#discussion_r752349624
##########
File path:
sql/src/main/java/org/apache/druid/sql/calcite/planner/DruidPlanner.java
##########
@@ -384,6 +399,46 @@ private PlannerResult planExplanation(
return new PlannerResult(resultsSupplier,
getExplainStructType(rel.getCluster().getTypeFactory()));
}
+ /**
+ * This method doesn't utilize the Calcite's internal {@link
RelOptUtil#dumpPlan} since that tends to be verbose
+ * and not indicative of the native Druid Queries which will get executed
+ * This method assumes that the Planner has converted the RelNodes to
DruidRels, and thereby we can implictly cast it
+ *
+ * @param rel Instance of the root {@link DruidRel} which is formed by
running the planner transformations on it
+ * @return A string representing an array of native queries that correspond
to the given SQL query, in JSON format
+ * @throws JsonProcessingException
+ */
+ private String explainSqlPlanAsNativeQueries(DruidRel<?> rel) throws
JsonProcessingException
+ {
+ // Only if rel is an instance of DruidUnionRel, do we run multiple native
queries corresponding to single SQL query
+ // Also, DruidUnionRel can only be a top level node, so we don't need to
check for this condition in the subsequent
+ // child nodes
+ List<DruidQuery> druidQueryList;
+ if (rel instanceof DruidUnionRel) {
+ druidQueryList = rel.getInputs().stream().map(childRel -> (DruidRel<?>)
childRel).map(childRel -> {
+ if (childRel instanceof DruidUnionRel) {
+ log.error("DruidUnionRel can only be the outermost RelNode. This
error shouldn't be encountered");
+ // TODO: Throw an error here
Review comment:
`ISE` makes sense to me.
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