chaokunyang commented on issue #1683:
URL: https://github.com/apache/fury/issues/1683#issuecomment-2171736538
Scala didn't provide a method to construct object with default value at
bytecode level. It generate bytecode to invoke constructor with all parameters
provided, and default params are provided at callsite.
If we need to provide default value when creating object, we need to extract
the default value. Fortunately, scala generate a
method like `SomeClass$.apply$default$2:()I`:
```scala
case class SomeClass(v: List[IdAnyVal], x:Int=1)
// Callsite bytecode
34: getstatic #131 // Field
org/apache/fury/serializer/SomeClass$.MODULE$:Lorg/apache/fury/serializer/SomeClass$;
37: invokevirtual #135 // Method
org/apache/fury/serializer/SomeClass$.apply$default$2:()I
40: invokespecial #138 // Method
org/apache/fury/serializer/SomeClass."<init>":(Lscala/collection/immutable/List;I)V
43: putstatic #87 // Field
p:Lorg/apache/fury/serializer/SomeClass;
46: getstatic #143 // Field
scala/Predef$.MODULE$:Lscala/Predef$;
```
We may can detect whether such method exists to know which parameter has
default value, and provide it as default value when constructing object. This
will take some horse work. We don't have time for this currently. Would you
like to contribute to this? The `record` contructor in Fury
`org.apache.fury.builder.ObjectCodecBuilder#createRecord/org.apache.fury.serializer.ObjectSerializer#read`
can be taken as an example.
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