Add back testcase for lp:817966 (was lost in the merge)

mysql-test/r/func_in.result

@@ -789,6 +789,19 @@ DROP TABLE t1;
 # End of test  BUG#13012483
 #
 End of 5.1 tests
+create table t1 (a bigint, b int);
+insert t1 values (1,1),(2,2),(3,3);
+select * from t1 where a in ('2.1');
+a	b
+select * from t1 where b in ('2.1');
+a	b
+select * from t1 where a='2.1';
+a	b
+select * from t1 where b='2.1';
+a	b
+select * from t1 where IF(1,a,a)='2.1';
+a	b
+drop table t1;
 #
 # LP bug#992380 Crash when creating PS for a query with
 # subquery in WHERE (see also mysql bug#13012483)

mysql-test/t/func_in.test

@@ -577,6 +577,24 @@ DROP TABLE t1;
 --echo #
 --echo End of 5.1 tests
 
+#
+# lp:817966 int_column IN (string_constant)
+#
+# rather illogically, when BIGINT field is compared to a string,
+# the string is converted to an integer, not to a double.
+# When some other integer field (not BIGINT) is compared to a string,
+# or when the BIGINT is not a field, but an expression, both
+# operands are compared as doubles. The latter behavior is correct,
+# according to the manual.
+#
+create table t1 (a bigint, b int);
+insert t1 values (1,1),(2,2),(3,3);
+select * from t1 where a in ('2.1');
+select * from t1 where b in ('2.1');
+select * from t1 where a='2.1'; 
+select * from t1 where b='2.1'; 
+select * from t1 where IF(1,a,a)='2.1'; 
+drop table t1;
 --echo #
 --echo # LP bug#992380 Crash when creating PS for a query with
 --echo # subquery in WHERE (see also mysql bug#13012483)