define_variant_to_primitive_builder

parquet_variant_compute::variant_to_arrow

Macro define_variant_to_primitive_builder 

Source 
macro_rules! define_variant_to_primitive_builder {
    (struct $name:ident<$lifetime:lifetime $(, $generic:ident: $bound:path )?>
    |$array_param:ident $(, $field:ident: $field_type:ty)?| -> $builder_name:ident $(< $array_type:ty >)? { $init_expr: expr },
    |$value: ident| $value_transform:expr,
    type_name: $type_name:expr) => { ... };
}