InnoDB: Fix ctype_utf8 test failure caused by the new record format.

innobase/btr/btr0btr.c:
  Cache the value of dtype_get_fixed_size(type) in order to avoid
  repeated calls to an external function innobase_is_mb_cset()
innobase/include/data0type.ic:
  Declare innobase_is_mb_cset().
  dtype_get_fixed_size(): Invoke innobase_is_mb_cset() for DATA_MYSQL.
innobase/row/row0ins.c:
  Cache the value of dtype_get_fixed_size(type) in order to avoid
  repeated calls to an external function innobase_is_mb_cset()
innobase/row/row0sel.c:
  row_search_for_mysql(): Added a missing rec_reget_offsets() call
  that caused an InnoDB debug assertion failure in ctype_utf8 test.
sql/ha_innodb.cc:
  Define innobase_is_mb_cset().

innobase/btr/btr0btr.c

@@ -2515,6 +2515,7 @@ btr_index_rec_validate(
 
 	for (i = 0; i < n; i++) {
 		dtype_t*	type = dict_index_get_nth_type(index, i);
+		ulint		fixed_size = dtype_get_fixed_size(type);
 
 		rec_get_nth_field(rec, offsets, i, &len);
 
@@ -2522,8 +2523,8 @@ btr_index_rec_validate(
 		their type is CHAR. */
 
 		if ((dict_index_get_nth_field(index, i)->prefix_len == 0
-		    && len != UNIV_SQL_NULL && dtype_is_fixed_size(type)
-		    && len != dtype_get_fixed_size(type))
+		    && len != UNIV_SQL_NULL && fixed_size
+		    && len != fixed_size)
 		   ||
 		   (dict_index_get_nth_field(index, i)->prefix_len > 0
 		    && len != UNIV_SQL_NULL

innobase/include/data0type.ic

@@ -8,6 +8,17 @@ Created 1/16/1996 Heikki Tuuri
 
 #include "mach0data.h"
 
+/**********************************************************************
+Determines whether the given character set is of variable length.
+
+NOTE: the prototype of this function is copied from ha_innodb.cc! If you change
+this function, you MUST change also the prototype here! */
+extern
+ibool
+innobase_is_mb_cset(
+/*================*/
+	ulint	cset);	/* in: MySQL charset-collation code */
+
 /*************************************************************************
 Sets a data type structure. */
 UNIV_INLINE
@@ -293,7 +304,13 @@ dtype_get_fixed_size(
 	case DATA_FLOAT:
 	case DATA_DOUBLE:
 	case DATA_MYSQL:
-			return(dtype_get_len(type));
+			if ((type->prtype & DATA_BINARY_TYPE)
+					|| !innobase_is_mb_cset(
+					dtype_get_charset_coll(
+						type->prtype))) {
+				return(dtype_get_len(type));
+			}
+			/* fall through for variable-length charsets */
 	case DATA_VARCHAR:
 	case DATA_BINARY:
 	case DATA_DECIMAL:

innobase/row/row0ins.c

@@ -473,6 +473,8 @@ row_ins_cascade_calc_update_vec(
 		
 			if (parent_ufield->field_no == parent_field_no) {
 
+				ulint	fixed_size;
+
 				/* A field in the parent index record is
 				updated. Let us make the update vector
 				field for the child table. */
@@ -512,22 +514,22 @@ row_ins_cascade_calc_update_vec(
 				need to pad with spaces the new value of the
 				child column */
 
-				if (dtype_is_fixed_size(type)
+				fixed_size = dtype_get_fixed_size(type);
+
+				if (fixed_size
 				    && ufield->new_val.len != UNIV_SQL_NULL
-				    && ufield->new_val.len
-				       < dtype_get_fixed_size(type)) {
+				    && ufield->new_val.len < fixed_size) {
 
 				        ufield->new_val.data =
 						mem_heap_alloc(heap,
-						  dtype_get_fixed_size(type));
-					ufield->new_val.len = 
-						dtype_get_fixed_size(type);
+								fixed_size);
+					ufield->new_val.len = fixed_size;
 					ut_a(dtype_get_pad_char(type)
 					     != ULINT_UNDEFINED);
 
 					memset(ufield->new_val.data,
 					       (byte)dtype_get_pad_char(type),
-					       dtype_get_fixed_size(type));
+					       fixed_size);
 					ut_memcpy(ufield->new_val.data,
 						parent_ufield->new_val.data,
 						parent_ufield->new_val.len);

innobase/row/row0sel.c

@@ -3694,6 +3694,8 @@ row_search_for_mysql(
 		}
 
 		if (prebuilt->clust_index_was_generated) {
+			offsets = rec_reget_offsets(index_rec, index, offsets,
+							ULINT_UNDEFINED, heap);
 			row_sel_store_row_id_to_prebuilt(prebuilt, index_rec,
 							index, offsets);
 		}

sql/ha_innodb.cc

@@ -520,6 +520,25 @@ innobase_mysql_print_thd(
 	putc('\n', f);
 }
 
+/**********************************************************************
+Determines whether the given character set is of variable length.
+
+NOTE that the exact prototype of this function has to be in
+/innobase/data/data0type.ic! */
+extern "C"
+ibool
+innobase_is_mb_cset(
+/*================*/
+	ulint	cset)	/* in: MySQL charset-collation code */
+{
+	CHARSET_INFO*	cs;
+	ut_ad(cset < 256);
+
+	cs = all_charsets[cset];
+
+	return(cs && cs->mbminlen != cs->mbmaxlen);
+}
+
 /**********************************************************************
 Compares NUL-terminated UTF-8 strings case insensitively.