presto-main/src/main/java/io/prestosql/execution/ResetSessionTask.java/ResetSessionTask/execute
class ResetSessionTask:    @Override
    public ListenableFuture<?> execute(ResetSession statement, TransactionManager transactionManager, Metadata metadata, AccessControl accessControl, QueryStateMachine stateMachine, List<Expression> parameters)
    {
        List<String> parts = statement.getName().getParts();
        if (parts.size() > 2) {
            throw semanticException(INVALID_SESSION_PROPERTY, statement, "Invalid session property '%s'", statement.getName());
        }

        // validate the property name
        if (parts.size() == 1) {
            metadata.getSessionPropertyManager().getSystemSessionPropertyMetadata(parts.get(0))
                    .orElseThrow(() -> semanticException(INVALID_SESSION_PROPERTY, statement, "Session property %s does not exist", statement.getName()));
        }
        else {
            CatalogName catalogName = metadata.getCatalogHandle(stateMachine.getSession(), parts.get(0))
                    .orElseThrow(() -> semanticException(CATALOG_NOT_FOUND, statement, "Catalog %s does not exist", parts.get(0)));
            metadata.getSessionPropertyManager().getConnectorSessionPropertyMetadata(catalogName, parts.get(1))
                    .orElseThrow(() -> semanticException(INVALID_SESSION_PROPERTY, statement, "Session property %s does not exist", statement.getName()));
        }

        stateMachine.addResetSessionProperties(statement.getName().toString());

        return immediateFuture(null);
    }