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SET @odl_sync_frm = @@global.sync_frm; Warnings: Warning 1287 '@@sync_frm' is deprecated and will be removed in a future release. SET @@global.sync_frm = OFF; Warnings: Warning 1287 '@@sync_frm' is deprecated and will be removed in a future release. DROP TABLE IF EXISTS t1; CREATE TABLE t1( a INT, b INT ); INSERT INTO t1 VALUES (1, 1), (2, 2), (3, 3), (4, 4); # 1. test regular tables # 1.1. test altering of columns that multiupdate doesn't use # 1.1.1. normal mode # 1.1.2. PS mode # 1.2. test altering of columns that multiupdate uses # 1.2.1. normal mode # 1.2.2. PS mode ALTER TABLE t1 ADD COLUMN a INT; # 2. test UNIONs # 2.1. test altering of columns that multiupdate doesn't use # 2.1.1. normal mode # 2.1.2. PS mode # 2.2. test altering of columns that multiupdate uses # 2.2.1. normal mode # 2.2.2. PS mode DROP TABLE t1; SET @@global.sync_frm = @odl_sync_frm; Warnings: Warning 1287 '@@sync_frm' is deprecated and will be removed in a future release.