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https://issues.apache.org/jira/browse/DRILL-2269?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jinfeng Ni reassigned DRILL-2269:
---------------------------------
Assignee: Jinfeng Ni
> Provide default implementation for getting cost of evaluating an expression
> in base class of LogicalExpression, in stead of throw Exception
> --------------------------------------------------------------------------------------------------------------------------------------------
>
> Key: DRILL-2269
> URL: https://issues.apache.org/jira/browse/DRILL-2269
> Project: Apache Drill
> Issue Type: Bug
> Reporter: Jinfeng Ni
> Assignee: Jinfeng Ni
>
> Today, the abstract class of LogicalExpression will throw Exception for two
> methods related to estimate the cost of evaluating an expression, in the hope
> that sub classes will override those two methods. However, if someone forgets
> to override, compiler and mvn build process will still be successful, yet
> will hit Exception in execution-time, complaining the sub class does not
> implement these methods. As Drill's adding more sub classes of
> LogicalExpression to the code base, it's more likely for someone to forget to
> override those two methods, making it error-prone to just throw Exception in
> the base class.
> In stead, we should provide a default implementation for those two methods in
> the base class. Certain sub classes will override to change the behavior.
>
>
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