Examples with ExplainHandler org.apache.drill.exec.planner.sql.handlers.ExplainHandler used on opensource projects

Example 1 with ExplainHandler

use of org.apache.drill.exec.planner.sql.handlers.ExplainHandler in project drill by apache.

the class DrillSqlWorker method getQueryPlan.

/**
   * Converts sql query string into query physical plan.
   *
   * @param context query context
   * @param sql sql query
   * @param textPlan text plan
   * @return query physical plan
   */
private static PhysicalPlan getQueryPlan(QueryContext context, String sql, Pointer<String> textPlan) throws ForemanSetupException {
    final SqlConverter parser = new SqlConverter(context);
    injector.injectChecked(context.getExecutionControls(), "sql-parsing", ForemanSetupException.class);
    final SqlNode sqlNode = parser.parse(sql);
    final AbstractSqlHandler handler;
    final SqlHandlerConfig config = new SqlHandlerConfig(context, parser);
    switch(sqlNode.getKind()) {
        case EXPLAIN:
            handler = new ExplainHandler(config, textPlan);
            break;
        case SET_OPTION:
            handler = new SetOptionHandler(context);
            break;
        case OTHER:
            if (sqlNode instanceof SqlCreateTable) {
                handler = ((DrillSqlCall) sqlNode).getSqlHandler(config, textPlan);
                break;
            }
            if (sqlNode instanceof DrillSqlCall) {
                handler = ((DrillSqlCall) sqlNode).getSqlHandler(config);
                break;
            }
        // fallthrough
        default:
            handler = new DefaultSqlHandler(config, textPlan);
    }
    try {
        return handler.getPlan(sqlNode);
    } catch (ValidationException e) {
        String errorMessage = e.getCause() != null ? e.getCause().getMessage() : e.getMessage();
        throw UserException.validationError(e).message(errorMessage).build(logger);
    } catch (AccessControlException e) {
        throw UserException.permissionError(e).build(logger);
    } catch (SqlUnsupportedException e) {
        throw UserException.unsupportedError(e).build(logger);
    } catch (IOException | RelConversionException e) {
        throw new QueryInputException("Failure handling SQL.", e);
    }
}