#
# wsrep_causal_reads
#
# save the initial values
SET @wsrep_causal_reads_global_saved = @@global.wsrep_causal_reads;
SET @wsrep_causal_reads_session_saved = @@session.wsrep_causal_reads;
# default
SELECT @@global.wsrep_causal_reads;
@@global.wsrep_causal_reads
0
SELECT @@session.wsrep_causal_reads;
@@session.wsrep_causal_reads
0

# scope and valid values
SET @@global.wsrep_causal_reads=OFF;
SELECT @@global.wsrep_causal_reads;
@@global.wsrep_causal_reads
0
SET @@global.wsrep_causal_reads=ON;
SELECT @@global.wsrep_causal_reads;
@@global.wsrep_causal_reads
1
SET @@session.wsrep_causal_reads=OFF;
SELECT @@session.wsrep_causal_reads;
@@session.wsrep_causal_reads
0
SET @@session.wsrep_causal_reads=ON;
SELECT @@session.wsrep_causal_reads;
@@session.wsrep_causal_reads
1
SET @@session.wsrep_causal_reads=default;
SELECT @@session.wsrep_causal_reads;
@@session.wsrep_causal_reads
1

# invalid values
SET @@global.wsrep_causal_reads=NULL;
ERROR 42000: Variable 'wsrep_causal_reads' can't be set to the value of 'NULL'
SET @@global.wsrep_causal_reads='junk';
ERROR 42000: Variable 'wsrep_causal_reads' can't be set to the value of 'junk'
SET @@session.wsrep_causal_reads=NULL;
ERROR 42000: Variable 'wsrep_causal_reads' can't be set to the value of 'NULL'
SET @@session.wsrep_causal_reads='junk';
ERROR 42000: Variable 'wsrep_causal_reads' can't be set to the value of 'junk'

# restore the initial values
SET @@global.wsrep_causal_reads = @wsrep_causal_reads_global_saved;
SET @@session.wsrep_causal_reads = @wsrep_causal_reads_session_saved;
# End of test