Bug#28497 wait_for_slave_to_stop can cause random replication mysql-test failures

 - Add funtion "query_get_value to allow reading a fields value
   into a $variable


client/mysqltest.c:
  - Add function "let $var= query_get_value(<query>,<colname>,<row>)"
    making it possible to read a value from a specific field in a query 
    into a $variable.
mysql-test/r/mysqltest.result:
  Add test cases for "query_get_value"
mysql-test/t/mysqltest.test:
  Add test cases for "query_get_value"

1 files changed, 39 insertions, 0 deletions

diff --git a/mysql-test/r/mysqltest.result b/mysql-test/r/mysqltest.result
index 000bec7023c..92265c94c4b 100644
--- a/mysql-test/r/mysqltest.result
+++ b/mysql-test/r/mysqltest.result
@@ -655,4 +655,43 @@ INSERT INTO t1 SELECT f1 - 256 FROM t1;
 INSERT INTO t1 SELECT f1 - 512 FROM t1;
 SELECT * FROM t1;
 DROP TABLE t1;
+CREATE TABLE t1(
+a int, b varchar(255), c datetime
+);
+SHOW COLUMNS FROM t1;
+Field	Type	Null	Key	Default	Extra
+a	int(11)	YES		NULL	
+b	varchar(255)	YES		NULL	
+c	datetime	YES		NULL	
+statement=SHOW COLUMNS FROM t1 row_number=1, column_name="Type", Value=int(11)
+statement="SHOW COLUMNS FROM t1" row_number=1, column_name="Type", Value=int(11)
+statement=SHOW COLUMNS FROM t1 row_number=1, column_name=Default, Value=NULL
+value= ->A B<-
+value= 1
+mysqltest: At line 1: query_get_value - argument list started with '(' must be ended with ')'
+mysqltest: At line 1: Missing required argument 'query' to command 'query_get_value'
+mysqltest: At line 1: Missing required argument 'column name' to command 'query_get_value'
+mysqltest: At line 1: Missing required argument 'row number' to command 'query_get_value'
+value= No such row
+value= No such row
+mysqltest: At line 1: Invalid row number: 'notnumber'
+mysqltest: At line 1: Could not find column 'column_not_exists' in the result of 'SHOW COLUMNS FROM t1'
+mysqltest: At line 1: Query 'SET @A = 1' didn't return a result set
+mysqltest: At line 1: Could not find column '1 AS B' in the result of 'SELECT 1 AS A'
+value= No such row
+mysqltest: At line 1: Error running query 'SHOW COLNS FROM t1': 1064 You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'COLNS FROM t1' at line 1
+
+Field Type Null Key Default Extra
+a int(11) YES -><- NULL 
+b varchar(255) YES -><- NULL 
+c datetime YES -><- NULL 
+
+Number of columns with Default NULL: 3
+
+SHOW COLUMNS FROM t1;
+Field	Type	Null	Key	Default	Extra
+a	int(11)	YES		NULL	
+b	varchar(255)	YES		NULL	
+c	datetime	YES		NULL	
+drop table t1;
 End of tests