Cleanup: Remove dict_ind_redundant

There is no reason for the dummy index object dict_ind_redundant
to exist any more. It was only being passed to btr_create().

btr_create(): If !index, assume that a ROW_FORMAT=REDUNDANT
table is being created.

We could pass ibuf.index, dict_sys.sys_tables->indexes.start
and so on, if those objects had been initialized before the
function btr_create() is called.

storage/innobase/btr/btr0btr.cc

@@ -1031,7 +1031,7 @@ btr_free_root_check(
 @param[in]	type			type of the index
 @param[in]	index_id		index id
 @param[in,out]	space			tablespace where created
-@param[in]	index			index
+@param[in]	index			index, or NULL to create a system table
 @param[in,out]	mtr			mini-transaction
 @return	page number of the created root
 @retval	FIL_NULL	if did not succeed */
@@ -1101,7 +1101,7 @@ btr_create(
 			/* Not enough space for new segment, free root
 			segment before return. */
 			btr_free_root(block, mtr,
-				      !index->table->is_temporary());
+				      !index || !index->table->is_temporary());
 			return(FIL_NULL);
 		}
 
@@ -1122,8 +1122,9 @@ btr_create(
 		ut_ad(!page_has_siblings(block->page.zip.data));
 		page_create_zip(block, index, 0, 0, mtr);
 	} else {
-		page_create(block, mtr, index->table->not_redundant());
-		if (index->is_spatial()) {
+		page_create(block, mtr,
+			    index && index->table->not_redundant());
+		if (index && index->is_spatial()) {
 			static_assert(((FIL_PAGE_INDEX & 0xff00)
 				       | byte(FIL_PAGE_RTREE))
 				      == FIL_PAGE_RTREE, "compatibility");
@@ -1148,7 +1149,8 @@ btr_create(
 
 	Note: Insert Buffering is disabled for temporary tables given that
 	most temporary tables are smaller in size and short-lived. */
-	if (!(type & DICT_CLUSTERED) && !index->table->is_temporary()) {
+	if (!(type & DICT_CLUSTERED)
+	    && (!index || !index->table->is_temporary())) {
 		ibuf_reset_free_bits(block);
 	}
 

storage/innobase/dict/dict0boot.cc

 /*****************************************************************************
 
 Copyright (c) 1996, 2017, Oracle and/or its affiliates. All Rights Reserved.
-Copyright (c) 2016, 2019, MariaDB Corporation.
+Copyright (c) 2016, 2020, MariaDB Corporation.
 
 This program is free software; you can redistribute it and/or modify it under
 the terms of the GNU General Public License as published by the Free Software
@@ -162,7 +162,7 @@ dict_hdr_create(
 	/*--------------------------*/
 	root_page_no = btr_create(DICT_CLUSTERED | DICT_UNIQUE,
 				  fil_system.sys_space, DICT_TABLES_ID,
-				  dict_ind_redundant, mtr);
+				  nullptr, mtr);
 	if (root_page_no == FIL_NULL) {
 
 		return(FALSE);
@@ -172,7 +172,7 @@ dict_hdr_create(
 	/*--------------------------*/
 	root_page_no = btr_create(DICT_UNIQUE,
 				  fil_system.sys_space, DICT_TABLE_IDS_ID,
-				  dict_ind_redundant, mtr);
+				  nullptr, mtr);
 	if (root_page_no == FIL_NULL) {
 
 		return(FALSE);
@@ -183,7 +183,7 @@ dict_hdr_create(
 	/*--------------------------*/
 	root_page_no = btr_create(DICT_CLUSTERED | DICT_UNIQUE,
 				  fil_system.sys_space, DICT_COLUMNS_ID,
-				  dict_ind_redundant, mtr);
+				  nullptr, mtr);
 	if (root_page_no == FIL_NULL) {
 
 		return(FALSE);
@@ -194,7 +194,7 @@ dict_hdr_create(
 	/*--------------------------*/
 	root_page_no = btr_create(DICT_CLUSTERED | DICT_UNIQUE,
 				  fil_system.sys_space, DICT_INDEXES_ID,
-				  dict_ind_redundant, mtr);
+				  nullptr, mtr);
 	if (root_page_no == FIL_NULL) {
 
 		return(FALSE);
@@ -205,7 +205,7 @@ dict_hdr_create(
 	/*--------------------------*/
 	root_page_no = btr_create(DICT_CLUSTERED | DICT_UNIQUE,
 				  fil_system.sys_space, DICT_FIELDS_ID,
-				  dict_ind_redundant, mtr);
+				  nullptr, mtr);
 	if (root_page_no == FIL_NULL) {
 
 		return(FALSE);

storage/innobase/dict/dict0dict.cc

@@ -40,9 +40,6 @@ Created 1/8/1996 Heikki Tuuri
 #include "sql_table.h"
 #include <mysql/service_thd_mdl.h>
 
-/** dummy index for ROW_FORMAT=REDUNDANT supremum and infimum records */
-dict_index_t*	dict_ind_redundant;
-
 #if defined UNIV_DEBUG || defined UNIV_IBUF_DEBUG
 /** Flag to control insert buffer debugging. */
 extern uint	ibuf_debug;
@@ -4357,34 +4354,6 @@ dict_set_merge_threshold_all_debug(
 
 #endif /* UNIV_DEBUG */
 
-/** Initialize dict_ind_redundant. */
-void
-dict_ind_init()
-{
-	dict_table_t*		table;
-
-	/* create dummy table and index for REDUNDANT infimum and supremum */
-	table = dict_mem_table_create("SYS_DUMMY1", NULL, 1, 0, 0, 0);
-	dict_mem_table_add_col(table, NULL, NULL, DATA_CHAR,
-			       DATA_ENGLISH | DATA_NOT_NULL, 8);
-
-	dict_ind_redundant = dict_mem_index_create(table, "SYS_DUMMY1", 0, 1);
-	dict_index_add_col(dict_ind_redundant, table,
-			   dict_table_get_nth_col(table, 0), 0);
-	/* avoid ut_ad(index->cached) in dict_index_get_n_unique_in_tree */
-	dict_ind_redundant->cached = TRUE;
-}
-
-/** Free dict_ind_redundant. */
-void
-dict_ind_free()
-{
-	dict_table_t*	table = dict_ind_redundant->table;
-	dict_mem_index_free(dict_ind_redundant);
-	dict_ind_redundant = NULL;
-	dict_mem_table_free(table);
-}
-
 /** Get an index by name.
 @param[in]	table		the table where to look for the index
 @param[in]	name		the index name to look for

storage/innobase/include/btr0btr.h

@@ -333,7 +333,7 @@ btr_node_ptr_get_child_page_no(
 @param[in]	type			type of the index
 @param[in,out]	space			tablespace where created
 @param[in]	index_id		index id
-@param[in]	index			index
+@param[in]	index			index, or NULL to create a system table
 @param[in,out]	mtr			mini-transaction
 @return	page number of the created root
 @retval	FIL_NULL	if did not succeed */

storage/innobase/include/dict0dict.h

@@ -2,7 +2,7 @@
 
 Copyright (c) 1996, 2018, Oracle and/or its affiliates. All Rights Reserved.
 Copyright (c) 2012, Facebook Inc.
-Copyright (c) 2013, 2019, MariaDB Corporation.
+Copyright (c) 2013, 2020, MariaDB Corporation.
 
 This program is free software; you can redistribute it and/or modify it under
 the terms of the GNU General Public License as published by the Free Software
@@ -1607,17 +1607,6 @@ extern dict_sys_t	dict_sys;
 #define dict_sys_lock() dict_sys.lock(__FILE__, __LINE__)
 #define dict_sys_unlock() dict_sys.unlock()
 
-/** dummy index for ROW_FORMAT=REDUNDANT supremum and infimum records */
-extern dict_index_t*	dict_ind_redundant;
-
-/** Initialize dict_ind_redundant. */
-void
-dict_ind_init();
-
-/** Free dict_ind_redundant. */
-void
-dict_ind_free();
-
 /* Auxiliary structs for checking a table definition @{ */
 
 /* This struct is used to specify the name and type that a column must

storage/innobase/srv/srv0srv.cc

@@ -761,10 +761,6 @@ static void srv_init()
 	mutex_create(LATCH_ID_PAGE_ZIP_STAT_PER_INDEX,
 		     &page_zip_stat_per_index_mutex);
 
-	/* Create dummy indexes for infimum and supremum records */
-
-	dict_ind_init();
-
 #ifdef WITH_INNODB_DISALLOW_WRITES
 	/* Writes have to be enabled on init or else we hang. Thus, we
 	always set the event here regardless of innobase_disallow_writes.
@@ -801,8 +797,6 @@ srv_free(void)
 
 	ut_d(os_event_destroy(srv_master_thread_disabled_event));
 
-	dict_ind_free();
-
 	trx_i_s_cache_free(trx_i_s_cache);
 	srv_thread_pool_end();
 }

storage/innobase/srv/srv0start.cc

@@ -1495,7 +1495,7 @@ dberr_t srv_start(bool create_new_db)
 
 		ulint ibuf_root = btr_create(
 			DICT_CLUSTERED | DICT_IBUF, fil_system.sys_space,
-			DICT_IBUF_ID_MIN, dict_ind_redundant, &mtr);
+			DICT_IBUF_ID_MIN, nullptr, &mtr);
 
 		mtr_commit(&mtr);