Macro define_logical_plan_node 

macro_rules! define_logical_plan_node {
    (
        $(#[$meta:meta])*
        pub struct $name:ident {
            $($field:ident: $type:ty),* $(,)?
        }
        enum: $enum_variant:ident
        input: ZeroInputNode
    ) => { ... };
    (
        $(#[$meta:meta])*
        pub struct $name:ident {
            $($field:ident: $type:ty),* $(,)?
        }
        enum: $enum_variant:ident
        input: MultipleInputNode
    ) => { ... };
}