From 0b2a20befcd58b08898f64db1b28a61a78ab37e9 Mon Sep 17 00:00:00 2001
From: yifanwu-sys <15507068379@163.com>
Date: Fri, 19 Jun 2026 11:45:03 +0800
Subject: [PATCH] [test](regression) Add malformed percent-encoding test cases
 for url_decode

---
 .../string_functions/test_url_decode.groovy   | 26 +++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/regression-test/suites/query_p0/sql_functions/string_functions/test_url_decode.groovy b/regression-test/suites/query_p0/sql_functions/string_functions/test_url_decode.groovy
index dd5cb9d35213fd..fc14f612cdd43b 100644
--- a/regression-test/suites/query_p0/sql_functions/string_functions/test_url_decode.groovy
+++ b/regression-test/suites/query_p0/sql_functions/string_functions/test_url_decode.groovy
@@ -44,4 +44,30 @@ suite("test_url_decode") {
     order_qt_const_nullable "select url_decode('') from test_url_decode" // choose one case to test const multi-rows
     order_qt_const_not_nullable "select url_decode('%2Fhome%2Fdoris%2Fdirectory%2F')"
     order_qt_const_nullable_no_null "select url_decode('%2Fhome%2Fdoris%2Fdirectory%2F')"
+
+    // malformed percent-encoding: url_decode should raise an error
+    test {
+        sql """ select url_decode('%2') """
+        exception "Decode url failed"
+    }
+    test {
+        sql """ select url_decode('%') """
+        exception "Decode url failed"
+    }
+    test {
+        sql """ select url_decode('hello%') """
+        exception "Decode url failed"
+    }
+    test {
+        sql """ select url_decode('%GG') """
+        exception "Decode url failed"
+    }
+    test {
+        sql """ select url_decode('%20%GG%41') """
+        exception "Decode url failed"
+    }
+    test {
+        sql """ select url_decode('%%20') """
+        exception "Decode url failed"
+    }
 }