MDEV-35330: Assertion marked_for_read() failed in VSec9::VSec9 | Item_func_from_unixtime::get_date

Problem:
  When a parameter in a prepared UPDATE statement uses DEFAULT value for
  a column (e.g., `EXECUTE IMMEDIATE 'UPDATE t SET b=?' USING DEFAULT`),
  and that column's default is derived from an expression or a function
  referencing another column (e.g., `FROM_UNIXTIME(a)`), the server fails
  to correctly mark the dependent column (`a`) for reading.

  This happened because the server failed to associate the `Item_param`
  (representing the `?` parameter) with its target field (`b`), leaving
  `Item_param::m_associated_field` uninitialized. This prevented the
  correct code path for evaluating the `DEFAULT` value, leading to the
  dependent column not being marked for read. When the column's value
  was later accessed, an assertion failed, causing a crash.

Fix:
  In the prepare stage of the UPDATE statement, associate each value
  with the target field, causing the server to take the correct code
  path (`Item_param::assign_default`) for evaluating DEFAULT values and
  marking dependent column for reading beforehand.

Only tests are included as it is a duplicate of MDEV-36870.

mysql-test/main/ps.result

@@ -5995,3 +5995,55 @@ DROP VIEW t1;
 #
 # End of 10.4 tests
 #
+#
+# MDEV-35330: Assertion `marked_for_read()` failed in VSec9::VSec9 | Item_func_from_unixtime::get_date
+#
+CREATE TABLE t (a INT,b TIMESTAMP DEFAULT FROM_UNIXTIME(a));
+INSERT INTO t VALUES (1,'2025-07-18 18:37:10');
+SELECT * FROM t;
+a	b
+1	2025-07-18 18:37:10
+EXECUTE IMMEDIATE 'UPDATE t SET b=?' USING DEFAULT;
+SELECT * FROM t;
+a	b
+1	1970-01-01 09:00:01
+DROP TABLE t;
+CREATE TABLE t (a INT, b INT DEFAULT (a+5));
+INSERT INTO t values (1,2), (2,DEFAULT);
+EXECUTE IMMEDIATE 'INSERT INTO t VALUES (3,4), (4,?)' USING DEFAULT;
+SELECT * FROM t;
+a	b
+1	2
+2	7
+3	4
+4	9
+EXECUTE IMMEDIATE 'UPDATE t SET b=?' USING DEFAULT;
+SELECT * FROM t;
+a	b
+1	6
+2	7
+3	8
+4	9
+DROP TABLE t;
+CREATE TABLE t (a INT,b TIMESTAMP DEFAULT FROM_UNIXTIME(a));
+INSERT INTO t VALUES (1,'2025-07-18 18:37:10');
+SELECT * FROM t;
+a	b
+1	2025-07-18 18:37:10
+PREPARE s FROM 'UPDATE t SET b=?';
+EXECUTE s USING DEFAULT;
+SELECT * FROM t;
+a	b
+1	1970-01-01 09:00:01
+DROP TABLE t;
+CREATE TABLE t (a INT, b TIMESTAMP DEFAULT FROM_UNIXTIME(a), c INT DEFAULT (a+5));
+INSERT INTO t VALUES (1,'2025-07-18 18:37:10',3);
+SELECT * FROM t;
+a	b	c
+1	2025-07-18 18:37:10	3
+EXECUTE IMMEDIATE 'UPDATE t SET b=?, c=?' USING DEFAULT, DEFAULT;
+SELECT * FROM t;
+a	b	c
+1	1970-01-01 09:00:01	6
+DROP TABLE t;
+# End of 10.6 tests

mysql-test/main/ps.test

@@ -5447,3 +5447,54 @@ DROP VIEW t1;
 --echo #
 --echo # End of 10.4 tests
 --echo #
+
+--echo #
+--echo # MDEV-35330: Assertion `marked_for_read()` failed in VSec9::VSec9 | Item_func_from_unixtime::get_date
+--echo #
+
+CREATE TABLE t (a INT,b TIMESTAMP DEFAULT FROM_UNIXTIME(a));
+INSERT INTO t VALUES (1,'2025-07-18 18:37:10');
+
+SELECT * FROM t;
+
+EXECUTE IMMEDIATE 'UPDATE t SET b=?' USING DEFAULT;
+
+SELECT * FROM t;
+
+DROP TABLE t;
+
+CREATE TABLE t (a INT, b INT DEFAULT (a+5));
+INSERT INTO t values (1,2), (2,DEFAULT);
+EXECUTE IMMEDIATE 'INSERT INTO t VALUES (3,4), (4,?)' USING DEFAULT;
+
+SELECT * FROM t;
+
+EXECUTE IMMEDIATE 'UPDATE t SET b=?' USING DEFAULT;
+
+SELECT * FROM t;
+
+DROP TABLE t;
+
+CREATE TABLE t (a INT,b TIMESTAMP DEFAULT FROM_UNIXTIME(a));
+INSERT INTO t VALUES (1,'2025-07-18 18:37:10');
+
+SELECT * FROM t;
+
+PREPARE s FROM 'UPDATE t SET b=?';
+EXECUTE s USING DEFAULT;
+
+SELECT * FROM t;
+
+DROP TABLE t;
+
+CREATE TABLE t (a INT, b TIMESTAMP DEFAULT FROM_UNIXTIME(a), c INT DEFAULT (a+5));
+INSERT INTO t VALUES (1,'2025-07-18 18:37:10',3);
+
+SELECT * FROM t;
+
+EXECUTE IMMEDIATE 'UPDATE t SET b=?, c=?' USING DEFAULT, DEFAULT;
+
+SELECT * FROM t;
+
+DROP TABLE t;
+--echo # End of 10.6 tests