[jira] [Created] (CALCITE-4996) [RelJson] create a new public toRex method which can override makeInputRef

["Marieke Gueye (Jira)" <ji...@apache.org>]

Marieke Gueye created CALCITE-4996:
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             Summary: [RelJson] create a new public toRex method which can override makeInputRef
                 Key: CALCITE-4996
                 URL: https://issues.apache.org/jira/browse/CALCITE-4996
             Project: Calcite
          Issue Type: Improvement
          Components: core
            Reporter: Marieke Gueye


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. 
```
/**
   * Transforms a RexNode tree defined in a map (from a JSON) into a RexNode
   * @param cluster: The optimization Environment
   * @param o the map derived from a RexNode transformed into a JSON
   * @param InputMapToRex is a BiFunction that transform the map representing input references into RexNode.
   *        it has two parameters: the map of the references and the RexBuilder
   * @return the RexNode
   */
  public RexNode toRex(RelOptCluster cluster, Object o, BiFunction<Map, RexBuilder, RexNode> InputMapToRex)

```

Make sure that `RexNode toRex(RelInput relInput, @PolyNull Object o) ` is still working



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