LakshSingla commented on code in PR #16572:
URL: https://github.com/apache/druid/pull/16572#discussion_r1647501428
##########
extensions-core/multi-stage-query/src/main/java/org/apache/druid/msq/querykit/results/ExportResultsFrameProcessor.java:
##########
@@ -167,9 +175,23 @@ private void exportFrame(final Frame frame)
for (int j = 0; j < exportRowSignature.size(); j++) {
String columnName = exportRowSignature.getColumnName(j);
BaseObjectColumnValueSelector<?> selector =
selectors.get(outputColumnNameToFrameColumnNumberMap.getInt(columnName));
- exportWriter.writeRowField(columnName, selector.getObject());
+ if (resultsContext == null) {
+ throw
DruidException.forPersona(DruidException.Persona.OPERATOR)
+
.ofCategory(DruidException.Category.RUNTIME_FAILURE)
+ .build("Received null resultsContext
from controller. This might be due to an upgrade.");
Review Comment:
We should add a remedy for the user in this case, something like - please
ensure the controller and the worker are on the same version before retrying
the query
```suggestion
.build("Received null resultsContext
from the controller. This is due to a version mismatch between the controller
and the worker. Please ensure that the worker and the controller are on the
same version before retrying the query.");
```
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