private Schema getLogSchema() {
    Schema schema = new Schema();
    FieldSchema fieldSchema = new FieldSchema();
    fieldSchema.setName("operation_log");
    fieldSchema.setType("string");
    schema.addToFieldSchemas(fieldSchema);
    return schema;
  }
Cancel the running operation unless it is already in a terminal state
@param opHandle
@throws HiveSQLException
service/src/java/org/apache/hive/service/cli/operation/OperationManager.java