Fix duplicate columns in parquet export (#484)

Co-authored-by: gradio-pr-bot <gradio-pr-bot@users.noreply.github.com>

Author: abidlabs

.changeset/funny-files-burn.md

@@ -0,0 +1,5 @@
+---
+"trackio": patch
+---
+
+feat:Fix duplicate columns in parquet export

trackio/sqlite_storage.py

@@ -294,9 +294,8 @@ def _flatten_json_column(df: pd.DataFrame, col: str) -> pd.DataFrame:
             index=df.index,
         )
         df = df.drop(columns=[col])
-        for c in expanded.columns:
-            df[c] = expanded[c]
-        return df
+        expanded = expanded.loc[:, ~expanded.columns.isin(df.columns)]
+        return pd.concat([df, expanded], axis=1)
 
     @staticmethod
     def _read_table(db_path: Path, table: str) -> pd.DataFrame: