LakshSingla commented on a change in pull request #12017:
URL: https://github.com/apache/druid/pull/12017#discussion_r761075609
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File path:
sql/src/main/java/org/apache/druid/sql/calcite/planner/DruidPlanner.java
##########
@@ -431,25 +431,26 @@ private PlannerResult planExplanation(
*/
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
ObjectMapper jsonMapper = plannerContext.getJsonMapper();
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");
- throw new ISE("DruidUnionRel is only supported at the outermost
RelNode.");
- }
- return childRel.toDruidQuery(false);
- }).collect(Collectors.toList());
- } else {
- druidQueryList = ImmutableList.of(rel.toDruidQuery(false));
+ try {
+ druidQueryList = flattenOutermostRel(rel)
+ .stream()
+ .map(druidRel -> druidRel.toDruidQuery(false))
+ .collect(Collectors.toList());
+
+ }
+ catch (UnsupportedOperationException unsupportedOperationException) {
Review comment:
`DruidUnionRel` throws it for unsupported operations:
[DruidUnionRel](https://github.com/apache/druid/blob/1f95a42bb8b32c314934e8e2ecdeb6569c7e8db3/sql/src/main/java/org/apache/druid/sql/calcite/rel/DruidUnionRel.java#L125)
Those operations which can be done on queries which translate directly to
native queries). Here `toDruidQuery` can throw the exception.
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