MDEV-7055: MySQL#74664 - InnoDB: Failing assertion: len <= col->len ||...

MDEV-7055: MySQL#74664 - InnoDB: Failing assertion: len <= col->len || col->mtype == 5 || (col->len == 0 && col->mtype == 1) in file rem0rec.cc line 845

Debug assertion maybe too strict.

mysql-test/suite/innodb/t/innodb-mdev-7055.test

+-- source include/have_innodb.inc
+
+# MDEV-7055: MySQL#74664 - InnoDB: Failing assertion: len <= col->len || col->mtype == 5 || (col->len == 0 && col->mtype == 1) in file rem0rec.cc line 845
+DROP DATABASE test;CREATE DATABASE test;USE test;
+set character_set_connection=ucs2;
+create TABLE t1 engine=innodb select if(0=0,'Y','N');
+insert INTO t1 values(date_format('2001-01-01','%W'));
+select * from t1;
+drop table t1;
\ No newline at end of file

storage/innobase/rem/rem0rec.c

@@ -830,7 +830,8 @@ rec_get_converted_size_comp_prefix_low(
 		}
 
 		ut_ad(len <= col->len || col->mtype == DATA_BLOB
-		      || (col->len == 0 && col->mtype == DATA_VARCHAR));
+			|| col->mtype == DATA_VARMYSQL
+			|| (col->len == 0 && col->mtype == DATA_VARCHAR));
 
 		fixed_len = field->fixed_len;
 		if (temp && fixed_len
@@ -1257,7 +1258,8 @@ rec_convert_dtuple_to_rec_comp(
 			*lens-- = (byte) len;
 		} else {
 			ut_ad(len <= dtype_get_len(type)
-			      || dtype_get_mtype(type) == DATA_BLOB);
+				|| dtype_get_mtype(type) == DATA_BLOB
+				|| dtype_get_mtype(type) == DATA_VARMYSQL);
 			if (len < 128
 			    || (dtype_get_len(type) < 256
 				&& dtype_get_mtype(type) != DATA_BLOB)) {

storage/xtradb/rem/rem0rec.c

@@ -830,7 +830,8 @@ rec_get_converted_size_comp_prefix_low(
 		}
 
 		ut_ad(len <= col->len || col->mtype == DATA_BLOB
-		      || (col->len == 0 && col->mtype == DATA_VARCHAR));
+			|| col->mtype == DATA_VARMYSQL
+			|| (col->len == 0 && col->mtype == DATA_VARCHAR));
 
 		fixed_len = field->fixed_len;
 		if (temp && fixed_len
@@ -1257,7 +1258,8 @@ rec_convert_dtuple_to_rec_comp(
 			*lens-- = (byte) len;
 		} else {
 			ut_ad(len <= dtype_get_len(type)
-			      || dtype_get_mtype(type) == DATA_BLOB);
+				|| dtype_get_mtype(type) == DATA_BLOB
+				|| dtype_get_mtype(type) == DATA_VARMYSQL);
 			if (len < 128
 			    || (dtype_get_len(type) < 256
 				&& dtype_get_mtype(type) != DATA_BLOB)) {