DRAFT unexpected ER_COLUMNACCESS_DENIED_ERROR during prepare of UPDATE

CREATE TABLE t1 (a INT, b INT);

INSERT INTO t1 VALUES (1, 1);

CREATE USER u@localhost;

GRANT UPDATE ON test.t1 TO u@localhost;  # UPDATE only, no SELECT

--connect (con1, localhost, u,, test)

# Non-PS: succeeds (no columns are read)

# PS mode: fails with ER_COLUMNACCESS_DENIED_ERROR (SELECT denied)

UPDATE t1 SET b = 2;

--connection default

DROP USER u@localhost;

DROP TABLE t1;