MDEV-15732: Assertion `next_free_value % real_increment == offset && …

…next_free_value >= reserved_until' failed in sequence_definition::adjust_values upon SETVAL for sequence with INCREMENT 0

there was a problem with "next_free_value >= reserved_until" condition:
SEQUENCE::set_value handle next_free_value & reserved_until after adjust_values() call, so it is incorect to put assert on it in adjust_values()

mysql-test/suite/sql_sequence/setval.result

@@ -254,3 +254,18 @@ def					SETVAL(s1,10)	8	20	2	Y	32896	0	63
 SETVAL(s1,10)
 10
 DROP SEQUENCE s1;
+#
+# MDEV-15732: Assertion `next_free_value % real_increment == offset &&
+# next_free_value >= reserved_until' failed in
+# sequence_definition::adjust_values upon SETVAL for sequence with
+# INCREMENT 0
+#
+CREATE SEQUENCE s INCREMENT 0;
+SELECT NEXTVAL(s);
+NEXTVAL(s)
+1
+SELECT SETVAL(s, 10);
+SETVAL(s, 10)
+10
+DROP SEQUENCE s;
+# End of 10.3 tests

mysql-test/suite/sql_sequence/setval.test

@@ -137,3 +137,20 @@ SELECT SETVAL(s1,10);
 DROP SEQUENCE s1;
 --enable_ps_protocol
 --disable_metadata
+
+--echo #
+--echo # MDEV-15732: Assertion `next_free_value % real_increment == offset &&
+--echo # next_free_value >= reserved_until' failed in
+--echo # sequence_definition::adjust_values upon SETVAL for sequence with
+--echo # INCREMENT 0
+--echo #
+
+CREATE SEQUENCE s INCREMENT 0;
+SELECT NEXTVAL(s);
+SELECT SETVAL(s, 10);
+
+# Cleanup
+DROP SEQUENCE s;
+
+
+--echo # End of 10.3 tests

sql/sql_sequence.cc

@@ -560,8 +560,7 @@ void sequence_definition::adjust_values(longlong next_value)
     else
     {
       next_free_value+= to_add;
-      DBUG_ASSERT(next_free_value % real_increment == offset &&
-                  next_free_value >= reserved_until);
+      DBUG_ASSERT(next_free_value % real_increment == offset);
     }
   }
 }