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https://issues.apache.org/jira/browse/DRILL-5723?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16161840#comment-16161840
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ASF GitHub Bot commented on DRILL-5723:
---------------------------------------

Github user ilooner commented on a diff in the pull request:

    https://github.com/apache/drill/pull/923#discussion_r138168189
  
    --- Diff: 
exec/java-exec/src/main/java/org/apache/drill/exec/server/options/OptionMetaData.java
 ---
    @@ -0,0 +1,68 @@
    +/**
    + * Licensed to the Apache Software Foundation (ASF) under one
    + * or more contributor license agreements.  See the NOTICE file
    + * distributed with this work for additional information
    + * regarding copyright ownership.  The ASF licenses this file
    + * to you under the Apache License, Version 2.0 (the
    + * "License"); you may not use this file except in compliance
    + * with the License.  You may obtain a copy of the License at
    + *
    + * http://www.apache.org/licenses/LICENSE-2.0
    + *
    + * Unless required by applicable law or agreed to in writing, software
    + * distributed under the License is distributed on an "AS IS" BASIS,
    + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    + * See the License for the specific language governing permissions and
    + * limitations under the License.
    + */
    +
    +package org.apache.drill.exec.server.options;
    +
    +/**
    + * Contains information about the scopes in which an option can be set, 
and an option's visibility.
    + */
    +public class OptionMetaData {
    +  public static final OptionMetaData DEFAULT = new 
OptionMetaData(OptionValue.OptionType.ALL, false, false);
    +
    +  private OptionValue.OptionType type;
    --- End diff --
    
    Done


> Support System/Session Internal Options And Additional Option System Fixes
> --------------------------------------------------------------------------
>
>                 Key: DRILL-5723
>                 URL: https://issues.apache.org/jira/browse/DRILL-5723
>             Project: Apache Drill
>          Issue Type: New Feature
>            Reporter: Timothy Farkas
>            Assignee: Timothy Farkas
>
> This is a feature proposed by [~ben-zvi].
> Currently all the options are accessible by the user in sys.options. We would 
> like to add internal options which can be altered, but are not visible in the 
> sys.options table. These internal options could be seen by another alias 
> select * from internal.options. The intention would be to put new options we 
> weren't comfortable with exposing to the end user in this table.
> After the options and their corresponding features are considered stable they 
> could be changed to appear in the sys.option table.
> A bunch of other fixes to the Option system have been clubbed into this:
> * OptionValidators no longer hold default values. Default values are 
> contained in the SystemOptionManager
> * Options have an OptionDefinition. The option definition includes:
>   * A validator
>   * Metadata about the options visibility, required permissions, and the 
> scope in which it can be set.
> * The Option Manager interface has been cleaned up so that a Type is not 
> required to be passed in in order to set and delete options



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