From 7ac59d1a36948ad7a9dfd40410101455837778d8 Mon Sep 17 00:00:00 2001
From: Lynn <lynn_inf@hotmail.com>
Date: Mon, 10 Aug 2026 20:08:06 +0800
Subject: [PATCH] Fix: set column type priority (#18054)

---
 rag/app/table.py | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/rag/app/table.py b/rag/app/table.py
index 7c7cbd1431..114f62dd58 100644
--- a/rag/app/table.py
+++ b/rag/app/table.py
@@ -392,7 +392,7 @@ def column_data_type(arr):
             if int(s) > 2**63 - 1:
                 float_flag = True
                 break
-        elif re.match(r"[+-]?[0-9.]{,19}$", s.replace("%%", "")) and not s.replace("%%", "").startswith("0"):
+        elif re.match(r"[+-]?[0-9]+\.[0-9]*$", s.replace("%%", "")) and not s.replace("%%", "").startswith("0"):
             counts["float"] += 1
         elif re.match(r"(true|yes|是|\*|✓|✔|☑|✅|√|false|no|否|⍻|×)$", s, flags=re.IGNORECASE):
             counts["bool"] += 1
@@ -403,7 +403,10 @@ def column_data_type(arr):
     if float_flag:
         ty = "float"
     else:
-        counts = sorted(counts.items(), key=lambda x: x[1] * -1)
+        # When counts tie, prefer types that lose less data:
+        # text (lossless) > datetime > float > int > bool
+        type_priority = {"text": 0, "datetime": 1, "float": 2, "int": 3, "bool": 4}
+        counts = sorted(counts.items(), key=lambda x: (x[1] * -1, type_priority[x[0]]))
         ty = counts[0][0]
     for i in range(len(arr)):
         if arr[i] is None: