[jira] [Closed] (CALCITE-4996) In RelJson, add a 'readExpression' method that can convert JSON to a RexNode expression

["Liya Fan (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/CALCITE-4996?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Liya Fan closed CALCITE-4996.
-----------------------------

Resolved in release 1.30.0 (2022-03-20)

> In RelJson, add a 'readExpression' method that can convert JSON to a RexNode expression
> ---------------------------------------------------------------------------------------
>
>                 Key: CALCITE-4996
>                 URL: https://issues.apache.org/jira/browse/CALCITE-4996
>             Project: Calcite
>          Issue Type: Improvement
>          Components: core
>            Reporter: Marieke Gueye
>            Assignee: Marieke Gueye
>            Priority: Minor
>              Labels: pull-request-available
>             Fix For: 1.30.0
>
>          Time Spent: 50m
>  Remaining Estimate: 0h
>
> In the case of our project, the environment that generates a JSON from a RexNode and the environment that reads it are different. We need to "translate" the inputs into their aliases in the new cluster. 
> This method will permit to give more freedom to the JSON RexNode parser if needed. 
> {code}
> /**
>    * Transforms a RexNode tree defined in a map (from a JSON) into a RexNode
>    * Applying a special method to inputs instead of transforming them into inputRef
>    * @param cluster The optimization environment
>    * @param apply is a InputTranslator lambda that transforms the map representing input
>    *               references into a RexNode
>    * @param o the map derived from a RexNode transformed into a JSON
>    * @return the transformed RexNode
>    */
> {code}
> Make sure that {{RexNode toRex(RelInput relInput, @PolyNull Object o)}} is still working + adding tests 



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