fix: remove erroneous [1] index from MAP tag access

DuckDB MAP['key'] returns the value directly, not a list.
The [1] was indexing into the string (e.g. 'run1'[1] = 'r').
Caught by test_map_format_extracts_run_id regression test.

Author: edmundmiller

bin/benchmark_report.py

@@ -224,12 +224,12 @@ def build_database(runs: list[dict], cur_path: str | None = None) -> duckdb.Duck
         is_map_format = "resource_tags" in cur_cols and "resource_tags_user_unique_run_id" not in cur_cols
 
         if is_map_format:
-            run_id_expr = "COALESCE(resource_tags['user_unique_run_id'][1], resource_tags['user_nf_unique_run_id'][1])"
-            process_expr = "resource_tags['user_pipeline_process'][1]"
-            hash_expr = "LEFT(resource_tags['user_task_hash'][1], 8)"
+            run_id_expr = "COALESCE(resource_tags['user_unique_run_id'], resource_tags['user_nf_unique_run_id'])"
+            process_expr = "resource_tags['user_pipeline_process']"
+            hash_expr = "LEFT(resource_tags['user_task_hash'], 8)"
             where_clause = (
-                "resource_tags['user_unique_run_id'][1] IS NOT NULL "
-                "OR resource_tags['user_nf_unique_run_id'][1] IS NOT NULL"
+                "resource_tags['user_unique_run_id'] IS NOT NULL "
+                "OR resource_tags['user_nf_unique_run_id'] IS NOT NULL"
             )
         else:
             # Old flattened-column format