Merge aivanov@bk-internal.mysql.com:/home/bk/mysql-5.1-new

into  mysql.com:/home/alexi/innodb-ss/mysql-5.1-ss28


mysql-test/r/innodb.result:
  Auto merged
mysql-test/t/innodb.test:
  Auto merged
sql/ha_innodb.cc:
  Auto merged

mysql-test/r/innodb.result

@@ -2437,7 +2437,9 @@ a	b
 20	NULL
 drop table t1;
 create table t1 (v varchar(65530), key(v));
-ERROR HY000: Can't create table 'test.t1' (errno: 139)
+Warnings:
+Warning	1071	Specified key was too long; max key length is 767 bytes
+drop table t1;
 create table t1 (v varchar(65536));
 Warnings:
 Note	1246	Converting column 'v' from VARCHAR to TEXT
@@ -2577,22 +2579,49 @@ create table t8 (col1 blob, index(col1(767)))
 character set = latin1 engine = innodb;
 create table t9 (col1 varchar(512), col2 varchar(512), index(col1, col2))
 character set = latin1 engine = innodb;
+show create table t9;
+Table	Create Table
+t9	CREATE TABLE `t9` (
+  `col1` varchar(512) default NULL,
+  `col2` varchar(512) default NULL,
+  KEY `col1` (`col1`,`col2`)
+) ENGINE=InnoDB DEFAULT CHARSET=latin1
 drop table t1, t2, t3, t4, t5, t6, t7, t8, t9;
-create table t1 (col1 varchar(768), index (col1))
+create table t1 (col1 varchar(768), index(col1))
 character set = latin1 engine = innodb;
-ERROR HY000: Can't create table 'test.t1' (errno: 139)
+Warnings:
-create table t2 (col1 varchar(768) primary key)
+Warning	1071	Specified key was too long; max key length is 767 bytes
+create table t2 (col1 varbinary(768), index(col1))
 character set = latin1 engine = innodb;
-ERROR HY000: Can't create table 'test.t2' (errno: 139)
+Warnings:
-create table t3 (col1 varbinary(768) primary key)
+Warning	1071	Specified key was too long; max key length is 767 bytes
+create table t3 (col1 text, index(col1(768)))
 character set = latin1 engine = innodb;
-ERROR HY000: Can't create table 'test.t3' (errno: 139)
+Warnings:
-create table t4 (col1 text, index(col1(768)))
+Warning	1071	Specified key was too long; max key length is 767 bytes
+create table t4 (col1 blob, index(col1(768)))
 character set = latin1 engine = innodb;
-ERROR HY000: Can't create table 'test.t4' (errno: 139)
+Warnings:
-create table t5 (col1 blob, index(col1(768)))
+Warning	1071	Specified key was too long; max key length is 767 bytes
+show create table t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `col1` varchar(768) default NULL,
+  KEY `col1` (`col1`(767))
+) ENGINE=InnoDB DEFAULT CHARSET=latin1
+drop table t1, t2, t3, t4;
+create table t1 (col1 varchar(768) primary key)
 character set = latin1 engine = innodb;
-ERROR HY000: Can't create table 'test.t5' (errno: 139)
+ERROR 42000: Specified key was too long; max key length is 767 bytes
+create table t2 (col1 varbinary(768) primary key)
+character set = latin1 engine = innodb;
+ERROR 42000: Specified key was too long; max key length is 767 bytes
+create table t3 (col1 text, primary key(col1(768)))
+character set = latin1 engine = innodb;
+ERROR 42000: Specified key was too long; max key length is 767 bytes
+create table t4 (col1 blob, primary key(col1(768)))
+character set = latin1 engine = innodb;
+ERROR 42000: Specified key was too long; max key length is 767 bytes
 CREATE TABLE t1
 (
 id INT PRIMARY KEY

mysql-test/t/innodb.test

@@ -1356,8 +1356,8 @@ source include/varchar.inc;
 # Clean up filename -- embedded server reports whole path without .frm,
 # regular server reports relative path with .frm (argh!)
 --replace_result \\ / $MYSQL_TEST_DIR . /var/master-data/ / t1.frm t1
---error 1005
 create table t1 (v varchar(65530), key(v));
+drop table t1;
 create table t1 (v varchar(65536));
 show create table t1;
 drop table t1;
@@ -1485,7 +1485,7 @@ CREATE TEMPORARY TABLE t2
 DROP TABLE t1;
 
 #
-# Test that index column max sizes are checked (bug #13315)
+# Test that index column max sizes are honored (bug #13315)
 #
 
 # prefix index
@@ -1512,22 +1512,36 @@ create table t8 (col1 blob, index(col1(767)))
 create table t9 (col1 varchar(512), col2 varchar(512), index(col1, col2))
  character set = latin1 engine = innodb;
 
+show create table t9;
+
 drop table t1, t2, t3, t4, t5, t6, t7, t8, t9;
 
---error 1005
+# these should have their index length trimmed
-create table t1 (col1 varchar(768), index (col1))
+create table t1 (col1 varchar(768), index(col1))
  character set = latin1 engine = innodb;
---error 1005
+create table t2 (col1 varbinary(768), index(col1))
-create table t2 (col1 varchar(768) primary key)
  character set = latin1 engine = innodb;
---error 1005
+create table t3 (col1 text, index(col1(768)))
-create table t3 (col1 varbinary(768) primary key)
  character set = latin1 engine = innodb;
---error 1005
+create table t4 (col1 blob, index(col1(768)))
-create table t4 (col1 text, index(col1(768)))
  character set = latin1 engine = innodb;
---error 1005
+
-create table t5 (col1 blob, index(col1(768)))
+show create table t1;
+
+drop table t1, t2, t3, t4;
+
+# these should be refused
+--error 1071
+create table t1 (col1 varchar(768) primary key)
+ character set = latin1 engine = innodb;
+--error 1071
+create table t2 (col1 varbinary(768) primary key)
+ character set = latin1 engine = innodb;
+--error 1071
+create table t3 (col1 text, primary key(col1(768)))
+ character set = latin1 engine = innodb;
+--error 1071
+create table t4 (col1 blob, primary key(col1(768)))
  character set = latin1 engine = innodb;
 
 #

sql/ha_innodb.cc

@@ -2540,6 +2540,12 @@ ha_innobase::open(
   	DBUG_RETURN(0);
 }
 
+uint
+ha_innobase::max_supported_key_part_length() const
+{
+	return(DICT_MAX_INDEX_COL_LEN - 1);
+}
+
 /**********************************************************************
 Closes a handle to an InnoDB table. */
 
@@ -4698,6 +4704,9 @@ create_index(
 				0, prefix_len);
 	}
 
+	/* Even though we've defined max_supported_key_part_length, we
+	still do our own checking using field_lengths to be absolutely
+	sure we don't create too long indexes. */
 	error = row_create_index_for_mysql(index, trx, field_lengths);
 
 	error = convert_error_code_to_mysql(error, NULL);

sql/ha_innodb.h

@@ -110,7 +110,7 @@ class ha_innobase: public handler
 				but currently MySQL does not work with keys
 				whose size is > MAX_KEY_LENGTH */
   	uint max_supported_key_length() const { return 3500; }
-  	uint max_supported_key_part_length() const { return 3500; }
+  	uint max_supported_key_part_length() const;
 	const key_map *keys_to_use_for_scanning() { return &key_map_full; }
   	bool has_transactions()  { return 1;}
 

storage/innobase/Makefile.am

@@ -23,7 +23,7 @@ TAR =			gtar
 noinst_HEADERS = ib_config.h
 
 SUBDIRS =		os ut btr buf data dict dyn eval fil fsp fut \
-			ha ibuf include lock log mach mem mtr page \
+			ha ibuf lock log mach mem mtr page \
 			pars que read rem row srv sync thr trx usr
 
 # Don't update the files from bitkeeper

storage/innobase/configure.in

@@ -128,7 +128,7 @@ AC_OUTPUT(Makefile os/Makefile ut/Makefile btr/Makefile dnl
 		buf/Makefile data/Makefile dnl
 		dict/Makefile dyn/Makefile dnl
 		eval/Makefile fil/Makefile fsp/Makefile fut/Makefile dnl
-		ha/Makefile ibuf/Makefile include/Makefile dnl
+		ha/Makefile ibuf/Makefile dnl
 		lock/Makefile log/Makefile dnl
 		mach/Makefile mem/Makefile mtr/Makefile dnl
 		page/Makefile pars/Makefile que/Makefile dnl

storage/innobase/db/db0err.h

@@ -1,44 +0,0 @@
-/******************************************************
-Global error codes for the database
-
-(c) 1996 Innobase Oy
-
-Created 5/24/1996 Heikki Tuuri
-*******************************************************/
-
-#ifndef db0err_h
-#define db0err_h
-
-
-#define DB_SUCCESS		10
-
-/* The following are error codes */
-#define	DB_ERROR		11
-#define DB_OUT_OF_MEMORY	12
-#define DB_OUT_OF_FILE_SPACE	13
-#define DB_LOCK_WAIT		14
-#define DB_DEADLOCK		15
-#define DB_ROLLBACK		16
-#define DB_DUPLICATE_KEY	17
-#define DB_QUE_THR_SUSPENDED	18
-#define DB_MISSING_HISTORY	19	/* required history data has been
-					deleted due to lack of space in
-					rollback segment */
-#define DB_CLUSTER_NOT_FOUND	30
-#define DB_TABLE_NOT_FOUND	31
-#define DB_MUST_GET_MORE_FILE_SPACE 32	/* the database has to be stopped
-					and restrated with more file space */
-#define DB_TABLE_IS_BEING_USED	33
-#define DB_TOO_BIG_RECORD	34	/* a record in an index would become
-					bigger than 1/2 free space in a page
-					frame */
-					
-/* The following are partial failure codes */
-#define DB_FAIL 		1000
-#define DB_OVERFLOW 		1001
-#define DB_UNDERFLOW 		1002
-#define DB_STRONG_FAIL		1003
-#define DB_RECORD_NOT_FOUND	1500
-#define DB_END_OF_INDEX		1501
-
-#endif 

storage/innobase/ha/ha0ha.c

@@ -40,9 +40,13 @@ ha_create(
 		table->adaptive = FALSE;
 	}
 
+	/* Creating MEM_HEAP_BTR_SEARCH type heaps can potentially fail,
+	but in practise it never should in this case, hence the asserts. */
+	
 	if (n_mutexes == 0) {
 		if (in_btr_search) {
 			table->heap = mem_heap_create_in_btr_search(4096);
+			ut_a(table->heap);
 		} else {
 			table->heap = mem_heap_create_in_buffer(4096);
 		}
@@ -57,6 +61,7 @@ ha_create(
 	for (i = 0; i < n_mutexes; i++) {
 		if (in_btr_search) {
 			table->heaps[i] = mem_heap_create_in_btr_search(4096);
+			ut_a(table->heaps[i]);
 		} else {
 			table->heaps[i] = mem_heap_create_in_buffer(4096);
 		}

storage/innobase/include/Makefile.am

@@ -1,60 +0,0 @@
-# Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult AB
-# & Innobase Oy
-# 
-# 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 Foundation; either version 2 of the License, or
-# (at your option) any later version.
-# 
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-# 
-# You should have received a copy of the GNU General Public License
-# along with this program; if not, write to the Free Software
-# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
-
-noinst_HEADERS = btr0btr.h btr0btr.ic btr0cur.h btr0cur.ic \
-        btr0pcur.h btr0pcur.ic btr0sea.h btr0sea.ic btr0types.h \
-        buf0buf.h buf0buf.ic buf0flu.h buf0flu.ic buf0lru.h \
-        buf0lru.ic buf0rea.h buf0types.h data0data.h data0data.ic data0type.h \
-        data0type.ic data0types.h db0err.h dict0boot.h \
-        dict0boot.ic dict0crea.h dict0crea.ic dict0dict.h \
-        dict0dict.ic dict0load.h dict0load.ic dict0mem.h \
-        dict0mem.ic dict0types.h dyn0dyn.h dyn0dyn.ic eval0eval.h \
-        eval0eval.ic eval0proc.h eval0proc.ic fil0fil.h fsp0fsp.h \
-        fsp0fsp.ic fut0fut.h fut0fut.ic fut0lst.h fut0lst.ic \
-        ha0ha.h ha0ha.ic hash0hash.h hash0hash.ic \
-        ibuf0ibuf.h ibuf0ibuf.ic ibuf0types.h lock0lock.h \
-        lock0lock.ic lock0types.h log0log.h log0log.ic log0recv.h \
-        log0recv.ic mach0data.h mach0data.ic \
-        mem0dbg.h mem0dbg.ic mem0mem.h mem0mem.ic mem0pool.h \
-        mem0pool.ic mtr0log.h mtr0log.ic mtr0mtr.h mtr0mtr.ic \
-        mtr0types.h os0file.h os0proc.h os0proc.ic \
-        os0sync.h os0sync.ic os0thread.h \
-        os0thread.ic page0cur.h page0cur.ic page0page.h \
-        page0page.ic page0types.h pars0grm.h pars0opt.h \
-        pars0opt.ic pars0pars.h pars0pars.ic pars0sym.h \
-        pars0sym.ic pars0types.h que0que.h que0que.ic que0types.h \
-        read0read.h read0read.ic read0types.h rem0cmp.h \
-        rem0cmp.ic rem0rec.h rem0rec.ic rem0types.h row0ins.h \
-        row0ins.ic row0mysql.h row0mysql.ic row0purge.h \
-        row0purge.ic row0row.h row0row.ic row0sel.h row0sel.ic \
-        row0types.h row0uins.h row0uins.ic row0umod.h row0umod.ic \
-        row0undo.h row0undo.ic row0upd.h row0upd.ic row0vers.h \
-        row0vers.ic srv0que.h srv0srv.h srv0srv.ic srv0start.h \
-        sync0arr.h sync0arr.ic sync0rw.h \
-        sync0rw.ic sync0sync.h sync0sync.ic sync0types.h \
-        thr0loc.h thr0loc.ic trx0purge.h trx0purge.ic trx0rec.h \
-        trx0rec.ic trx0roll.h trx0roll.ic trx0rseg.h trx0rseg.ic \
-        trx0sys.h trx0sys.ic trx0trx.h trx0trx.ic trx0types.h \
-        trx0undo.h trx0undo.ic trx0xa.h univ.i \
-        usr0sess.h usr0sess.ic usr0types.h ut0byte.h ut0byte.ic \
-        ut0dbg.h ut0lst.h ut0mem.h ut0mem.ic ut0rnd.h ut0rnd.ic \
-        ut0sort.h ut0ut.h ut0ut.ic
-
-EXTRA_DIST = Makefile.i
-
-# Don't update the files from bitkeeper
-%::SCCS/s.%

storage/innobase/include/ha0ha.h

@@ -68,21 +68,6 @@ ha_insert_for_fold(
 				node is created! */
 	void*		data);	/* in: data, must not be NULL */
 /*****************************************************************
-Reserves the necessary hash table mutex and inserts an entry into the hash
-table. */
-UNIV_INLINE
-ibool
-ha_insert_for_fold_mutex(
-/*=====================*/
-				/* out: TRUE if succeed, FALSE if no more
-				memory could be allocated */
-	hash_table_t*	table,	/* in: hash table */
-	ulint		fold,	/* in: folded value of data; if a node with
-				the same fold value already exists, it is
-				updated to point to the same data, and no new
-				node is created! */
-	void*		data);	/* in: data, must not be NULL */
-/*****************************************************************
 Deletes an entry from a hash table. */
 
 void

storage/innobase/include/ha0ha.ic

@@ -191,30 +191,3 @@ ha_search_and_delete_if_found(
 
 	return(FALSE);
 }
-
-/*****************************************************************
-Reserves the necessary hash table mutex and inserts an entry into the hash
-table. */
-UNIV_INLINE
-ibool
-ha_insert_for_fold_mutex(
-/*=====================*/
-				/* out: TRUE if succeed, FALSE if no more
-				memory could be allocated */
-	hash_table_t*	table,	/* in: hash table */
-	ulint		fold,	/* in: folded value of data; if a node with
-				the same fold value already exists, it is
-				updated to point to the same data, and no new
-				node is created! */
-	void*		data)	/* in: data, must not be NULL */
-{
-	ibool	ret;
-
-	hash_mutex_enter(table, fold);
-
-	ret = ha_insert_for_fold(table, fold, data);
-
-	hash_mutex_exit(table, fold);
-
-	return(ret);
-}

storage/innobase/include/mem0mem.h

@@ -31,13 +31,18 @@ typedef mem_block_info_t	mem_block_t;
 typedef mem_block_t	mem_heap_t;
 
 /* Types of allocation for memory heaps: DYNAMIC means allocation from the
-dynamic memory pool of the C compiler, BUFFER means allocation from the index
+dynamic memory pool of the C compiler, BUFFER means allocation from the
-page buffer pool; the latter method is used for very big heaps */
+buffer pool; the latter method is used for very big heaps */
 
 #define MEM_HEAP_DYNAMIC	0	/* the most common type */
 #define MEM_HEAP_BUFFER		1
-#define MEM_HEAP_BTR_SEARCH	2	/* this flag can be ORed to the
+#define MEM_HEAP_BTR_SEARCH	2	/* this flag can optionally be
-					previous */
+					ORed to MEM_HEAP_BUFFER, in which
+					case heap->free_block is used in
+					some cases for memory allocations,
+					and if it's NULL, the memory
+					allocation functions can return
+					NULL. */
 
 /* The following start size is used for the first block in the memory heap if
 the size is not specified, i.e., 0 is given as the parameter in the call of
@@ -98,13 +103,15 @@ heap freeing. */
 					  (heap), __FILE__, __LINE__)
 /*********************************************************************
 NOTE: Use the corresponding macros instead of this function. Creates a
-memory heap which allocates memory from dynamic space. For debugging
+memory heap. For debugging purposes, takes also the file name and line as
-purposes, takes also the file name and line as argument. */
+arguments. */
 UNIV_INLINE
 mem_heap_t*
 mem_heap_create_func(
 /*=================*/
-					/* out, own: memory heap */
+					/* out, own: memory heap, NULL if
+					did not succeed (only possible for
+					MEM_HEAP_BTR_SEARCH type heaps)*/
 	ulint		n,		/* in: desired start block size,
 					this means that a single user buffer
 					of size n will fit in the block, 
@@ -121,11 +128,9 @@ mem_heap_create_func(
 					block is not unintentionally erased
 					(if allocated in the stack), before
 					the memory heap is explicitly freed. */
-	ulint		type,		/* in: MEM_HEAP_DYNAMIC
+	ulint		type,		/* in: heap type */ 
-					or MEM_HEAP_BUFFER */ 
 	const char*	file_name,	/* in: file name where created */
-	ulint		line		/* in: line where created */
+	ulint		line);		/* in: line where created */
-	);
 /*********************************************************************
 NOTE: Use the corresponding macro instead of this function. Frees the space
 occupied by a memory heap. In the debug version erases the heap memory
@@ -143,8 +148,9 @@ UNIV_INLINE
 void*
 mem_heap_alloc(
 /*===========*/
-				/* out: allocated storage, NULL if
+				/* out: allocated storage, NULL if did not
-				did not succeed */
+				succeed (only possible for
+				MEM_HEAP_BTR_SEARCH type heaps) */
 	mem_heap_t*   	heap, 	/* in: memory heap */
 	ulint           n);	/* in: number of bytes; if the heap is allowed
 				to grow into the buffer pool, this must be
@@ -220,8 +226,7 @@ UNIV_INLINE
 void*
 mem_alloc_func(
 /*===========*/
-					/* out, own: free storage, NULL
+					/* out, own: free storage */
-					if did not succeed */
 	ulint		n,		/* in: desired number of bytes */
 	const char*	file_name,	/* in: file name where created */
 	ulint		line		/* in: line where created */
@@ -235,8 +240,7 @@ with mem_free. */
 void*
 mem_alloc_func_noninline(
 /*=====================*/
-					/* out, own: free storage,
+					/* out, own: free storage */
-					NULL if did not succeed */
 	ulint		n,		/* in: desired number of bytes */
 	const char*	file_name,	/* in: file name where created */
 	ulint		line		/* in: line where created */

storage/innobase/include/mem0mem.ic

@@ -16,8 +16,9 @@ Creates a memory heap block where data can be allocated. */
 mem_block_t*
 mem_heap_create_block(
 /*==================*/
-				/* out, own: memory heap block,
+				/* out, own: memory heap block, NULL if
-				NULL if did not succeed */
+				did not succeed (only possible for
+				MEM_HEAP_BTR_SEARCH type heaps) */
 	mem_heap_t*	heap,	/* in: memory heap or NULL if first block
 				should be created */
 	ulint		n,	/* in: number of bytes needed for user data, or
@@ -50,7 +51,8 @@ mem_block_t*
 mem_heap_add_block(
 /*===============*/
 				/* out: created block, NULL if did not
-				succeed */
+				succeed (only possible for
+				MEM_HEAP_BTR_SEARCH type heaps)*/
 	mem_heap_t* 	heap,	/* in: memory heap */
 	ulint		n);	/* in: number of bytes user needs */
 
@@ -126,7 +128,9 @@ UNIV_INLINE
 void*
 mem_heap_alloc(
 /*===========*/
-				/* out: allocated storage */
+				/* out: allocated storage, NULL if did not
+				succeed (only possible for
+				MEM_HEAP_BTR_SEARCH type heaps) */
 	mem_heap_t*	heap, 	/* in: memory heap */
 	ulint           n)      /* in: number of bytes; if the heap is allowed
 				to grow into the buffer pool, this must be
@@ -370,13 +374,15 @@ mem_heap_free_top(
 
 /*********************************************************************
 NOTE: Use the corresponding macros instead of this function. Creates a
-memory heap which allocates memory from dynamic space. For debugging
+memory heap. For debugging purposes, takes also the file name and line as
-purposes, takes also the file name and line as argument. */
+argument. */
 UNIV_INLINE
 mem_heap_t*
 mem_heap_create_func(
 /*=================*/
-					/* out, own: memory heap */
+					/* out, own: memory heap, NULL if
+					did not succeed (only possible for
+					MEM_HEAP_BTR_SEARCH type heaps)*/
 	ulint		n,		/* in: desired start block size,
 					this means that a single user buffer
 					of size n will fit in the block, 
@@ -393,11 +399,9 @@ mem_heap_create_func(
 					block is not unintentionally erased
 					(if allocated in the stack), before
 					the memory heap is explicitly freed. */
-	ulint		type,		/* in: MEM_HEAP_DYNAMIC
+	ulint		type,		/* in: heap type */ 
-					or MEM_HEAP_BUFFER */ 
 	const char*	file_name,	/* in: file name where created */
-	ulint		line		/* in: line where created */
+	ulint		line)		/* in: line where created */
-	)
 {
 	mem_block_t*   block; 
 
@@ -409,7 +413,10 @@ mem_heap_create_func(
 					init_block, type, file_name, line);
 	}
 
-	ut_ad(block);
+	if (block == NULL) {
+		
+		return(NULL);
+	}
 	
 	UT_LIST_INIT(block->base);
 
@@ -418,11 +425,6 @@ mem_heap_create_func(
 
 #ifdef UNIV_MEM_DEBUG
 
-	if (block == NULL) {
-
-		return(block);
-	}
-
 	mem_hash_insert(block, file_name, line);
 
 #endif
@@ -484,8 +486,7 @@ UNIV_INLINE
 void*
 mem_alloc_func(
 /*===========*/
-					/* out, own: free storage, NULL
+					/* out, own: free storage */
-					if did not succeed */
 	ulint		n,		/* in: desired number of bytes */
 	const char*	file_name,	/* in: file name where created */
 	ulint		line		/* in: line where created */
@@ -496,10 +497,6 @@ mem_alloc_func(
 
 	heap = mem_heap_create_func(n, NULL, MEM_HEAP_DYNAMIC, file_name,
 									line);
-	if (heap == NULL) {
-
-		return(NULL);
-	}
 
 	/* Note that as we created the first block in the heap big enough
 	for the buffer requested by the caller, the buffer will be in the

storage/innobase/lock/lock0lock.c

@@ -1705,7 +1705,7 @@ static
 lock_t*
 lock_rec_create(
 /*============*/
-				/* out: created lock, NULL if out of memory */
+				/* out: created lock */
 	ulint		type_mode,/* in: lock mode and wait flag, type is
 				ignored and replaced by LOCK_REC */
 	rec_t*		rec,	/* in: record on page */
@@ -1747,11 +1747,6 @@ lock_rec_create(
 
 	lock = mem_heap_alloc(trx->lock_heap, sizeof(lock_t) + n_bytes);
 
-	if (UNIV_UNLIKELY(lock == NULL)) {
-
-		return(NULL);
-	}
-
 	UT_LIST_ADD_LAST(trx_locks, trx->trx_locks, lock);
 
 	lock->trx = trx;
@@ -1886,8 +1881,7 @@ static
 lock_t*
 lock_rec_add_to_queue(
 /*==================*/
-				/* out: lock where the bit was set, NULL if out
+				/* out: lock where the bit was set */
-				of memory */
 	ulint		type_mode,/* in: lock mode, wait, gap etc. flags;
 				type is ignored and replaced by LOCK_REC */
 	rec_t*		rec,	/* in: record on page */
@@ -3405,8 +3399,7 @@ UNIV_INLINE
 lock_t*
 lock_table_create(
 /*==============*/
-				/* out, own: new lock object, or NULL if
+				/* out, own: new lock object */
-				out of memory */
 	dict_table_t*	table,	/* in: database table in dictionary cache */
 	ulint		type_mode,/* in: lock mode possibly ORed with
 				LOCK_WAIT */
@@ -3432,11 +3425,6 @@ lock_table_create(
 		lock = mem_heap_alloc(trx->lock_heap, sizeof(lock_t));
 	}
 
-	if (lock == NULL) {
-
-		return(NULL);
-	}
-
 	UT_LIST_ADD_LAST(trx_locks, trx->trx_locks, lock);
 
 	lock->type_mode = type_mode | LOCK_TABLE;

storage/innobase/mem/mem0mem.c

@@ -92,12 +92,10 @@ with mem_free. */
 void*
 mem_alloc_func_noninline(
 /*=====================*/
-					/* out, own: free storage,
+					/* out, own: free storage */
-					NULL if did not succeed */
 	ulint		n,		/* in: desired number of bytes */
 	const char*	file_name,	/* in: file name where created */
-	ulint		line		/* in: line where created */
+	ulint		line)		/* in: line where created */
-	)
 {
 	return(mem_alloc_func(n, file_name, line));	
 }
@@ -122,8 +120,9 @@ Creates a memory heap block where data can be allocated. */
 mem_block_t*
 mem_heap_create_block(
 /*==================*/
-				/* out, own: memory heap block,
+				/* out, own: memory heap block, NULL if
-				NULL if did not succeed */
+				did not succeed (only possible for
+				MEM_HEAP_BTR_SEARCH type heaps) */
 	mem_heap_t*	heap,	/* in: memory heap or NULL if first block
 				should be created */
 	ulint		n,	/* in: number of bytes needed for user data, or
@@ -182,6 +181,8 @@ mem_heap_create_block(
 	}
 
 	if (block == NULL) {
+		/* Only MEM_HEAP_BTR_SEARCH allocation should ever fail. */
+		ut_a(type & MEM_HEAP_BTR_SEARCH);
 
 		return(NULL);
 	}
@@ -222,7 +223,8 @@ mem_block_t*
 mem_heap_add_block(
 /*===============*/
 				/* out: created block, NULL if did not
-				succeed */
+				succeed (only possible for
+				MEM_HEAP_BTR_SEARCH type heaps)*/
 	mem_heap_t* 	heap,	/* in: memory heap */
 	ulint		n)	/* in: number of bytes user needs */
 {