feat: dealing with empty list in alt_ans field

crag_sampler/utils.py

@@ -269,18 +269,19 @@ def create_stratified_subsets(
 def write_subset(
     input_file: str, indices: List[int], output_file: str, compress: bool = True
 ) -> None:
-    """Write a single subset to a file using awk.
-
-    Args:
-        input_file: Path to input JSONL file
-        indices: List of indices to extract
-        output_file: Path to output file
-        compress: Whether to compress output
-    """
-    # Convert indices to 1-based indexing and create NR condition
-    indices_set = set(i + 1 for i in indices)  # Convert to 1-based indexing
+    """Write a single subset to a file using awk."""
+    indices_set = set(i + 1 for i in indices)
     nr_conditions = " || ".join(f"NR == {i}" for i in sorted(indices_set))
-    awk_script = f"{nr_conditions}"
+
+    # Add alt_ans field handling to awk script
+    awk_script = f"""
+    {{ 
+        if ({nr_conditions}) {{ 
+            # Convert empty alt_ans arrays to arrays with empty string
+            gsub(/"alt_ans": \\[\\]/, "\\"alt_ans\\": [\\"\\"]");
+            print 
+        }} 
+    }}"""
 
     if input_file.endswith(".bz2"):
         if compress: