From 9ed7624edcd5b9033ab4ce7190705c58df2644ff Mon Sep 17 00:00:00 2001
From: Sean <22557931+sean0407@users.noreply.github.com>
Date: Sun, 11 Oct 2026 14:31:27 +0800
Subject: [PATCH 1/2] Fix agtype integer division overflow

---
 regress/expected/expr.out          | 6 ++++++
 regress/sql/expr.sql               | 5 +++++
 src/backend/utils/adt/agtype_ops.c | 8 ++++++++
 3 files changed, 19 insertions(+)

diff --git a/regress/expected/expr.out b/regress/expected/expr.out
index 806a6f65c..e6f8a8fdc 100644
--- a/regress/expected/expr.out
+++ b/regress/expected/expr.out
@@ -26,6 +26,12 @@ NOTICE:  graph "expr" has been created
  
 (1 row)
 
+-- Integer division must report bigint overflow instead of raising SIGFPE.
+SELECT * FROM cypher('expr', $$
+RETURN (-9223372036854775807 - 1) / -1
+$$) AS (r agtype);
+ERROR:  bigint out of range
+
 --
 -- map literal
 --
diff --git a/regress/sql/expr.sql b/regress/sql/expr.sql
index d4d900a1c..34b80ae04 100644
--- a/regress/sql/expr.sql
+++ b/regress/sql/expr.sql
@@ -23,6 +23,11 @@ SET search_path TO ag_catalog;
 
 SELECT * FROM create_graph('expr');
 
+-- Integer division must report bigint overflow instead of raising SIGFPE.
+SELECT * FROM cypher('expr', $$
+RETURN (-9223372036854775807 - 1) / -1
+$$) AS (r agtype);
+
 --
 -- map literal
 --
diff --git a/src/backend/utils/adt/agtype_ops.c b/src/backend/utils/adt/agtype_ops.c
index 9a1c4033e..480ca3ea0 100644
--- a/src/backend/utils/adt/agtype_ops.c
+++ b/src/backend/utils/adt/agtype_ops.c
@@ -795,6 +795,14 @@ Datum agtype_div(PG_FUNCTION_ARGS)
             PG_RETURN_NULL();
         }
 
+        if (agtv_lhs->val.int_value == PG_INT64_MIN &&
+            agtv_rhs->val.int_value == -1)
+        {
+            ereport(ERROR, (errcode(ERRCODE_NUMERIC_VALUE_OUT_OF_RANGE),
+                            errmsg("bigint out of range")));
+            PG_RETURN_NULL();
+        }
+
         agtv_result.type = AGTV_INTEGER;
         agtv_result.val.int_value = agtv_lhs->val.int_value /
                                     agtv_rhs->val.int_value;

From ce6da4fbe65a2428ade4f7125628b5026cd80491 Mon Sep 17 00:00:00 2001
From: Sean <22557931+sean0407@users.noreply.github.com>
Date: Wed, 21 Oct 2026 15:38:20 +0800
Subject: [PATCH 2/2] Fix bigint overflow regression output

---
 regress/expected/expr.out | 1 -
 1 file changed, 1 deletion(-)

diff --git a/regress/expected/expr.out b/regress/expected/expr.out
index e6f8a8fdc..5db1d1719 100644
--- a/regress/expected/expr.out
+++ b/regress/expected/expr.out
@@ -31,7 +31,6 @@ SELECT * FROM cypher('expr', $$
 RETURN (-9223372036854775807 - 1) / -1
 $$) AS (r agtype);
 ERROR:  bigint out of range
-
 --
 -- map literal
 --