[GitHub] [calcite] pengzhiwei2018 edited a comment on issue #1176: [CALCITE-3000] Improve SqlUserDefinedFunction and SqlUserDefinedTable…

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pengzhiwei2018 edited a comment on issue #1176: [CALCITE-3000] Improve SqlUserDefinedFunction and SqlUserDefinedTable…
URL: https://github.com/apache/calcite/pull/1176#issuecomment-485074534
 
 
   This PR has improved SqlUserDefinedFunction & SqlUserDefinedTableFunction to support overload method call for both user-defined scalar function and table function. 
   Here is the mainly change list:
   (1) Add `SqlUtil#findBestMatchMethod` to support find best matched method in the function class.
   (2) Support dynamic type inference according to the calling argument types based on (1).(`SqlFunction#getReturnTypeInferenceForClass`、`SqlFunction#getOperandTypeInferenceForClass` and `SqlFunction#getOperandTypeCheckerForClass`)
   (3) Add `argTypes` and `typeFactory` parameters to `ImplementableFunction#getImplementor` to create `CallImplementor` according to the argument types.
   (4) Add `argTypes` and `typeFactory` parameters to `TableFunction#getRowType` to infer return type according to the argument types.
   (5) Add `JavaScalarFunction` and `JavaTableFunction` to represent the function schema mapping a java class.  

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