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SET @start_global_value = @@global.alter_algorithm; SET GLOBAL alter_algorithm=1.1; ERROR 42000: Incorrect argument type to variable 'alter_algorithm' SET GLOBAL alter_algorithm=-1; ERROR 42000: Variable 'alter_algorithm' can't be set to the value of '-1' SET GLOBAL alter_algorithm=weird; ERROR 42000: Variable 'alter_algorithm' can't be set to the value of 'weird' SET GLOBAL alter_algorithm=4; SELECT @@global.alter_algorithm; @@global.alter_algorithm INSTANT SET GLOBAL alter_algorithm=3; SELECT @@global.alter_algorithm; @@global.alter_algorithm NOCOPY SET GLOBAL alter_algorithm=0; SELECT @@global.alter_algorithm; @@global.alter_algorithm DEFAULT SET GLOBAL alter_algorithm=1; SELECT @@global.alter_algorithm; @@global.alter_algorithm COPY SET GLOBAL alter_algorithm=2; SELECT @@global.alter_algorithm; @@global.alter_algorithm INPLACE SET GLOBAL alter_algorithm=5; ERROR 42000: Variable 'alter_algorithm' can't be set to the value of '5' SELECT @@global.alter_algorithm; @@global.alter_algorithm INPLACE SET GLOBAL alter_algorithm=NOCOPY; SET alter_algorithm=1.1; ERROR 42000: Incorrect argument type to variable 'alter_algorithm' SET alter_algorithm=-1; ERROR 42000: Variable 'alter_algorithm' can't be set to the value of '-1' SET alter_algorithm=weird; ERROR 42000: Variable 'alter_algorithm' can't be set to the value of 'weird' SET alter_algorithm=4; SELECT @@alter_algorithm; @@alter_algorithm INSTANT SET alter_algorithm=3; SELECT @@alter_algorithm; @@alter_algorithm NOCOPY SET alter_algorithm=0; SELECT @@alter_algorithm; @@alter_algorithm DEFAULT SET alter_algorithm=1; SELECT @@alter_algorithm; @@alter_algorithm COPY SET alter_algorithm=2; SELECT @@alter_algorithm; @@alter_algorithm INPLACE SET alter_algorithm=5; ERROR 42000: Variable 'alter_algorithm' can't be set to the value of '5' SELECT @@alter_algorithm; @@alter_algorithm INPLACE SET SESSION alter_algorithm=INSTANT; SHOW SESSION VARIABLES LIKE 'alter_algorithm'; Variable_name Value alter_algorithm INSTANT SET SESSION alter_algorithm=DEFAULT; SHOW SESSION VARIABLES LIKE 'alter_algorithm'; Variable_name Value alter_algorithm NOCOPY SET SESSION alter_algorithm='DEFAULT'; SHOW SESSION VARIABLES LIKE 'alter_algorithm'; Variable_name Value alter_algorithm DEFAULT SET SESSION alter_algorithm=DEFAULT; SHOW SESSION VARIABLES LIKE 'alter_algorithm'; Variable_name Value alter_algorithm NOCOPY SET GLOBAL alter_algorithm=DEFAULT; SHOW SESSION VARIABLES LIKE 'alter_algorithm'; Variable_name Value alter_algorithm NOCOPY SET SESSION alter_algorithm=DEFAULT; SHOW SESSION VARIABLES LIKE 'alter_algorithm'; Variable_name Value alter_algorithm DEFAULT SET GLOBAL alter_algorithm = @start_global_value;