Remove batching nulls logic from string_array_to_variant

Author: sdf-jkl

parquet-variant-compute/src/from_json.rs

@@ -26,21 +26,12 @@ use parquet_variant_json::JsonToVariant;
 /// Macro to convert string array to variant array
 macro_rules! string_array_to_variant {
     ($input:expr, $array:expr, $builder:expr) => {{
-        let len = $input.len();
-        let mut i = 0;
-        while i < len {
-            if $input.is_valid(i) {
+        for i in 0..$input.len() {
+            if $input.is_null(i) {
+                $builder.append_null();
+            } else {
                 $builder.append_json($array.value(i))?;
-                i += 1;
-                continue;
             }
-
-            let start = i;
-            i += 1;
-            while i < len && $input.is_null(i) {
-                i += 1;
-            }
-            $builder.append_nulls(i - start);
         }
     }};
 }