Remove DICT_UNIVERSAL

The only universal index in InnoDB was the change buffer.
It suffices to keep the DICT_IBUF flag (which, like DICT_UNIVERSAL,
is not written to any persistent data structure).

storage/innobase/dict/dict0defrag_bg.cc

@@ -290,7 +290,7 @@ dict_stats_save_defrag_summary(
 	dberr_t	ret=DB_SUCCESS;
 	lint	now = (lint) ut_time();
 
-	if (dict_index_is_univ(index)) {
+	if (dict_index_is_ibuf(index)) {
 		return DB_SUCCESS;
 	}
 
@@ -320,7 +320,7 @@ dict_stats_save_defrag_stats(
 {
 	dberr_t	ret;
 
-	if (dict_index_is_univ(index)) {
+	if (dict_index_is_ibuf(index)) {
 		return DB_SUCCESS;
 	}
 

storage/innobase/ibuf/ibuf0ibuf.cc

@@ -559,7 +559,7 @@ ibuf_init_at_db_start(void)
 
 	ibuf->index = dict_mem_index_create(
 		"innodb_change_buffer", "CLUST_IND",
-		IBUF_SPACE_ID, DICT_CLUSTERED | DICT_UNIVERSAL | DICT_IBUF, 1);
+		IBUF_SPACE_ID, DICT_CLUSTERED | DICT_IBUF, 1);
 	ibuf->index->id = DICT_IBUF_ID_MIN + IBUF_SPACE_ID;
 	ibuf->index->table = dict_mem_table_create(
 		"innodb_change_buffer", IBUF_SPACE_ID, 1, 0, 0, 0);

storage/innobase/include/dict0dict.ic

@@ -326,20 +326,6 @@ dict_index_is_unique(
 	return(index->type & DICT_UNIQUE);
 }
 
-/********************************************************************//**
-Check whether the index is an universal index tree.
-@return	nonzero for universal tree, zero for other indexes */
-UNIV_INLINE
-ulint
-dict_index_is_univ(
-/*===============*/
-	const dict_index_t*	index)	/*!< in: index */
-{
-	ut_ad(index->magic_n == DICT_INDEX_MAGIC_N);
-
-	return(index->type & DICT_UNIVERSAL);
-}
-
 /********************************************************************//**
 Check whether the index is a Spatial Index.
 @return	nonzero for Spatial Index, zero for other indexes */

storage/innobase/include/dict0mem.h

@@ -66,8 +66,6 @@ combination of types */
 				auto-generated clustered indexes,
 				also DICT_UNIQUE will be set */
 #define DICT_UNIQUE	2	/*!< unique index */
-#define	DICT_UNIVERSAL	4	/*!< index which can contain records from any
-				other index */
 #define	DICT_IBUF	8	/*!< insert buffer tree */
 #define	DICT_CORRUPT	16	/*!< bit to store the corrupted flag
 				in SYS_INDEXES.TYPE */

storage/innobase/srv/srv0start.cc

@@ -2139,7 +2139,7 @@ innobase_start_or_create_for_mysql()
 		compile_time_assert(IBUF_SPACE_ID == 0);
 
 		ulint ibuf_root = btr_create(
-			DICT_CLUSTERED | DICT_UNIVERSAL | DICT_IBUF,
+			DICT_CLUSTERED | DICT_IBUF,
 			0, univ_page_size, DICT_IBUF_ID_MIN,
 			dict_ind_redundant, NULL, &mtr);