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Do not issue a 'read-only' error in case of DROP TEMPORARY TABLE on a non-existing temporary table. Instead produce the correct "Unknown table" error or warning (in cases when the IF EXISTS clause was specified). To a documentor: the part of the manual describing the 'read_only' system variable should be clarified to state the following: "When the read_only variable is set to ON, all operations which create/update/drop tables are rejected with the exceptions for: 1. Any operation performed by the replication thread on a slave server 2. Any operation performed by a user that have the SUPER privilege 3. Any operation that creates/updates/drops only temporary tables" mysql-test/r/read_only.result: Added testcases for bug #22077 "DROP TEMPORARY TABLE fails with wrong error if read_only is set" mysql-test/t/read_only.test: Added testcases for bug #22077 "DROP TEMPORARY TABLE fails with wrong error if read_only is set" sql/sql_parse.cc: Before issuing the 'read-only' error also check if the operation is not a DROP TEMPORARY TABLE statement
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