From b5b88cf77249b0fd2725883d1631737ee7983424 Mon Sep 17 00:00:00 2001
From: "Gerber, Mike" <mike.gerber@sbb.spk-berlin.de>
Date: Fri, 8 Aug 2025 13:59:40 +0200
Subject: [PATCH] =?UTF-8?q?=F0=9F=90=9B=20Add=20index=20column=20as=20regu?=
 =?UTF-8?q?lar=20column,=20too?=
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Closes gh-63.
---
 src/mods4pandas/lib.py | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/mods4pandas/lib.py b/src/mods4pandas/lib.py
index 6e1005b..96644ed 100644
--- a/src/mods4pandas/lib.py
+++ b/src/mods4pandas/lib.py
@@ -423,6 +423,9 @@ def insert_into_db_multiple(con, table, ld: List[Dict]):
 def convert_db_to_parquet(con, table, index_col, output_file):
     df = pd.read_sql_query(f"SELECT * FROM {table}", con, index_col)
 
+    # Add index column as regular column, too
+    df[index_col] = df.index
+
     # Convert Python column type into Pandas type
     for c in df.columns:
         column_type = current_columns_types[table][c]