prestodb/presto · error · PrestoException

NOT_SUPPORTED

NOT_SUPPORTED

Error message

Unsupported statement type: " + preparedQuery.getStatementClass().getSimpleName()

What it means

Default-case guard in LocalDispatchQueryFactory.createDispatchQuery: the prepared query's statement class is not one of the supported dispatch types (the switch over statement kinds fell through), so no query execution machinery exists for it. The statement class simple name is included.

Source

Thrown at presto-main/src/main/java/com/facebook/presto/dispatcher/LocalDispatchQueryFactory.java:166

                preparedQuery.getPrepareSql(),
                session,
                locationFactory.createQueryLocation(session.getQueryId()),
                resourceGroup,
                queryType,
                preparedQuery.isTransactionControlStatement(),
                transactionManager,
                accessControl,
                executor,
                metadata,
                warningCollector);

        stateMachine.addStateChangeListener(new QueryStateTracingListener(stateMachine.getSession().getTracer().orElse(NoopTracerProvider.NOOP_TRACER)));
        queryMonitor.queryCreatedEvent(stateMachine.getBasicQueryInfo(Optional.empty()));

        ListenableFuture<QueryExecution> queryExecutionFuture = executor.submit(() -> {
            QueryExecutionFactory<?> queryExecutionFactory = executionFactoriesManager.getExecutionFactory(preparedQuery);
            if (queryExecutionFactory == null) {
                throw new PrestoException(NOT_SUPPORTED, "Unsupported statement type: " + preparedQuery.getStatementClass().getSimpleName());
            }

            return queryExecutionFactory.createQueryExecution(analyzerProviderManager.getAnalyzerProvider(getAnalyzerType(session)), preparedQuery, stateMachine, slug, retryCount, warningCollector, queryType, accessControl, query);
        });

        return new LocalDispatchQuery(
                stateMachine,
                queryMonitor,
                queryExecutionFuture,
                clusterSizeMonitor,
                executor,
                queryQueuer,
                queryManager::createQuery,
                retryCount > 0,
                queryPrerequisitesManager);
    }
}

View on GitHub (pinned to 55bb57d202)

Solutions

1. Report as a bug or unsupported feature: a statement type reached dispatch without a matching execution path
2. Retry with an equivalent supported statement form

When it happens

Trigger: Thrown at presto-main/src/main/java/com/facebook/presto/dispatcher/LocalDispatchQueryFactory.java:166 when the library encounters an invalid state.

Common situations: See trigger scenarios.

Understand the failure class

Background: Presto NOT_SUPPORTED error: what "not supported" means and how to fix it — this error's family across 3 libraries.

AI-assisted analysis of prestodb/presto@55bb57d202 (2026-09-04). Data as JSON: /api/errors/9de9f15b2e92a417. Report an issue: GitHub.