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https://issues.apache.org/jira/browse/FLINK-12881?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Xu Yang updated FLINK-12881:
----------------------------
    Environment:     (was: *)

> Add more functionalities for ML Params and ParamInfo class
> ----------------------------------------------------------
>
>                 Key: FLINK-12881
>                 URL: https://issues.apache.org/jira/browse/FLINK-12881
>             Project: Flink
>          Issue Type: Sub-task
>            Reporter: Xu Yang
>            Assignee: Xu Yang
>            Priority: Major
>
> * change Params$get to support aliases
>  support aliases
>  if the Params contains the specific parameter and alias, but has more than 
> one value or
>  if the Params doesn't contains the specific parameter, while the ParamInfo 
> is optional but has no default value
>  when isOptional is true, contain(ParamInfo) is true, it will return the 
> value found in Params, whether the value is null or not. when isOptional is 
> true, contain(ParamInfo) is false: hasDefaultValue is true, it will return 
> defaultValue. hasDefaultValue is false, it will throw exception. developer 
> should use contain to check that Params has ParamInfo or not.
>  * add size, clear, isEmpty, contains, fromJson in Params
>  * fix ParamInfo, PipelineStage to adapt new Params
>  * add test cases about aliases



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