ha_innodb.cc:

  Fix bug #9526 in InnoDB: the internal type of an ENUM or SET is an unsigned integer type, not a character string

sql/ha_innodb.cc

@@ -1923,8 +1923,11 @@ inline
 ulint
 get_innobase_type_from_mysql_type(
 /*==============================*/
-			/* out: DATA_BINARY, DATA_VARCHAR, ... */
-	Field*	field)	/* in: MySQL field */
+				/* out: DATA_BINARY, DATA_VARCHAR, ... */
+	ulint*	unsigned_flag,	/* out: DATA_UNSIGNED if an 'unsigned type';
+				at least ENUM and SET, and unsigned integer
+				types are 'unsigned types' */
+	Field*	field)		/* in: MySQL field */
 {
 	/* The following asserts try to check that the MySQL type code fits in
 	8 bits: this is used in ibuf and also when DATA_NOT_NULL is ORed to
@@ -1936,6 +1939,27 @@ get_innobase_type_from_mysql_type(
 	DBUG_ASSERT((ulint)FIELD_TYPE_FLOAT < 256);
 	DBUG_ASSERT((ulint)FIELD_TYPE_DECIMAL < 256);
 
+	if (field->flags & UNSIGNED_FLAG) {
+
+		*unsigned_flag = DATA_UNSIGNED;
+	} else {
+		*unsigned_flag = 0;
+	}
+
+	if (field->real_type() == FIELD_TYPE_ENUM
+	    || field->real_type() == FIELD_TYPE_SET) {
+
+		/* MySQL has field->type() a string type for these, but the
+		data is actually internally stored as an unsigned integer
+		code! */
+
+		*unsigned_flag = DATA_UNSIGNED; /* MySQL has its own unsigned
+						flag set to zero, even though
+						internally this is an unsigned
+						integer type */
+		return(DATA_INT);
+	}
+
 	switch (field->type()) {
 	        /* NOTE that we only allow string types in DATA_MYSQL
 		and DATA_VARMYSQL */
@@ -1968,8 +1992,6 @@ get_innobase_type_from_mysql_type(
 		case FIELD_TYPE_DATETIME:
 		case FIELD_TYPE_YEAR:
 		case FIELD_TYPE_NEWDATE:
-		case FIELD_TYPE_ENUM:
-		case FIELD_TYPE_SET:
 		case FIELD_TYPE_TIME:
 		case FIELD_TYPE_TIMESTAMP:
 					return(DATA_INT);
@@ -2247,10 +2269,10 @@ build_template(
 					get_field_offset(table, field);
 
 		templ->mysql_col_len = (ulint) field->pack_length();
-		templ->type = get_innobase_type_from_mysql_type(field);
+		templ->type = get_innobase_type_from_mysql_type(
+					&templ->is_unsigned, field);
 		templ->charset = dtype_get_charset_coll_noninline(
 				index->table->cols[i].type.prtype);
-		templ->is_unsigned = (ulint) (field->flags & UNSIGNED_FLAG);
 
 		if (templ->type == DATA_BLOB) {
 			prebuilt->templ_contains_blob = TRUE;
@@ -2676,9 +2698,8 @@ calc_row_difference(
 		o_len = field->pack_length();
 		n_len = field->pack_length();
 
-		col_type = get_innobase_type_from_mysql_type(field);
-		is_unsigned = (ulint) (field->flags & UNSIGNED_FLAG);
-
+		col_type = get_innobase_type_from_mysql_type(&is_unsigned,
+									field);
 		switch (col_type) {
 
 		case DATA_BLOB:
@@ -3546,19 +3567,14 @@ create_table_def(
 	for (i = 0; i < n_cols; i++) {
 		field = form->field[i];
 
-		col_type = get_innobase_type_from_mysql_type(field);
+		col_type = get_innobase_type_from_mysql_type(&unsigned_type,
+								field);
 		if (field->null_ptr) {
 			nulls_allowed = 0;
 		} else {
 			nulls_allowed = DATA_NOT_NULL;
 		}
 
-		if (field->flags & UNSIGNED_FLAG) {
-			unsigned_type = DATA_UNSIGNED;
-		} else {
-			unsigned_type = 0;
-		}
-
 		if (field->binary()) {
 			binary_type = DATA_BINARY_TYPE;
 		} else {
@@ -3612,6 +3628,7 @@ create_index(
 	ulint		ind_type;
 	ulint		col_type;
 	ulint		prefix_len;
+	ulint		is_unsigned;
   	ulint		i;
   	ulint		j;
 
@@ -3661,7 +3678,8 @@ create_index(
 
 		ut_a(j < form->fields);
 
-		col_type = get_innobase_type_from_mysql_type(key_part->field);
+		col_type = get_innobase_type_from_mysql_type(
+					&is_unsigned, key_part->field);
 
 		if (DATA_BLOB == col_type
 		    || key_part->length < field->pack_length()) {