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From "Arina Ielchiieva (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (DRILL-5330) NPE in FunctionImplementationRegistry.functionReplacement()
Date Wed, 15 Mar 2017 10:03:41 GMT

     [ https://issues.apache.org/jira/browse/DRILL-5330?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Arina Ielchiieva updated DRILL-5330:
------------------------------------
    Labels: ready-to-commit  (was: )

> NPE in FunctionImplementationRegistry.functionReplacement()
> -----------------------------------------------------------
>
>                 Key: DRILL-5330
>                 URL: https://issues.apache.org/jira/browse/DRILL-5330
>             Project: Apache Drill
>          Issue Type: Bug
>    Affects Versions: 1.10.0
>            Reporter: Paul Rogers
>            Assignee: Paul Rogers
>              Labels: ready-to-commit
>             Fix For: 1.11.0
>
>
> The code in {{FunctionImplementationRegistry.functionReplacement()}} will produce an
NPE if ever it is called:
> {code}
>           if (optionManager != null
>               && optionManager.getOption(
>                    ExecConstants.CAST_TO_NULLABLE_NUMERIC).bool_val
>               ...
> {code}
> If an option manager is provided, then get the specified option. The option manager will
contain a value for that option only if the user has explicitly set that option. Suppose the
user had not set the option. Then the return from {{getOption()}} will be null.
> The next thing we do is *assume* that the option exists and is a boolean by dereferencing
the option. This will trigger an NPE. This NPE was seen in detail-level unit tests.
> The proper way to handle such options is to use an option validator. Strangely, one actually
exists in {{ExecConstants}}:
> {code}
>   String CAST_TO_NULLABLE_NUMERIC = "drill.exec.functions.cast_empty_string_to_null";
>   OptionValidator CAST_TO_NULLABLE_NUMERIC_OPTION = new BooleanValidator(CAST_TO_NULLABLE_NUMERIC,
false);
> {code}
> Then do:
> {code}
> optionManager.getOption(
>          ExecConstants.CAST_TO_NULLABLE_NUMERIC_OPTION)
> {code}



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