Add feature stamp

app.py

@@ -1,6 +1,6 @@
 import json
 import os
-
+import uuid
 import pandas as pd
 import streamlit as st
 import argparse
@@ -198,13 +198,14 @@ elif selected_language == 'Python':
 else:
     raise ValueError(f'{selected_language} language is not supported.')
 try:
+    stamp = '{}'.format(uuid.uuid4())
     os.makedirs('tmp_for_vis/', exist_ok=True)
     with st.spinner("Executing program ..."):
-        exec_answer = executor.nsql_exec(binder_program, db)
+        exec_answer = executor.nsql_exec(stamp, binder_program, db)
     # todo: Make it more pretty!
     # todo: Do we need vis for Python?
     if selected_language == 'SQL':
-        with open("tmp_for_vis/tmp_for_vis_steps.txt", "r") as f:
+        with open("tmp_for_vis/{}_tmp_for_vis_steps.txt".format(stamp), "r") as f:
             steps = json.load(f)
         st.markdown("#### Steps & Intermediate results")
         for i, step in enumerate(steps):
@@ -212,7 +213,7 @@ try:
             st.text("↓")
             with st.spinner('...'):
                 time.sleep(1)
-            with open("tmp_for_vis/result_step_{}.txt".format(i), "r") as f:
+            with open("tmp_for_vis/{}_result_step_{}.txt".format(stamp, i), "r") as f:
                 result_in_this_step = json.load(f)
             if isinstance(result_in_this_step, Dict):
                 st.dataframe(pd.DataFrame(pd.DataFrame(result_in_this_step["rows"], columns=result_in_this_step["header"])))