merge with 3.23.47

Docs/manual.texi:
  Auto merged
innobase/row/row0ins.c:
  Auto merged
mysql-test/r/innodb.result:
  Auto merged
sql/mysqld.cc:
  Use local version.

Docs/manual.texi

@@ -48099,6 +48099,12 @@ not yet 100% confident in this code.
 @appendixsubsec Changes in release 3.23.47
 @itemize @bullet
 @item
+InnoDB now supports @code{NULL} in keys.
+@item
+Fixed shutdown problem on HPUX. (Introduced in 3.23.46)
+@item
+Added 'DO expression' command.
+@item
 Fixed core-dump bug in replication when using SELECT RELEASE_LOCK();
 @item
 Added new statement DO expression,[expression].

innobase/log/log0recv.c

@@ -564,8 +564,15 @@ recv_parse_or_apply_log_rec_body(
 	} else if (type <= MLOG_WRITE_STRING) {
 		new_ptr = mlog_parse_string(ptr, end_ptr, page);
 	} else {
-		new_ptr = NULL; /* Eliminate compiler warning */
-		ut_error;
+		new_ptr = NULL;
+
+	        fprintf(stderr,
+		 "InnoDB: WARNING: the log file may have been corrupt and it\n"
+		 "InnoDB: is possible that the log scan did not proceed\n"
+		 "InnoDB: far enough in recovery. Please run CHECK TABLE\n"
+		 "InnoDB: on your InnoDB tables to check that they are ok!\n"
+		 "InnoDB: Corrupt log record type %lu\n",
+			                                  (ulint)type);
 	}
 
 	ut_ad(!page || new_ptr);
@@ -1316,9 +1323,29 @@ recv_parse_log_rec(
 
 	new_ptr = mlog_parse_initial_log_record(ptr, end_ptr, type, space,
 								page_no);
+
+	/* If the operating system writes to the log complete 512-byte
+	blocks, we should not get the warnings below in recovery.
+        A warning means that the header and the trailer appeared ok
+	in a 512-byte block, but in the middle there was something wrong.
+	TODO: (1) add similar warnings in the case there is an incompletely
+	written log record which does not extend to the boundary of a
+	512-byte block. (2) Add a checksum to a log block. */
+
+	if (!new_ptr) {
+	        return(0);
+	}
+
 	/* Check that space id and page_no are sensible */
 
-	if (!new_ptr || *space != 0 || *page_no > 0x8FFFFFFF) {
+	if (*space != 0 || *page_no > 0x8FFFFFFF) {
+	        fprintf(stderr,
+		 "InnoDB: WARNING: the log file may have been corrupt and it\n"
+		 "InnoDB: is possible that the log scan did not proceed\n"
+		 "InnoDB: far enough in recovery. Please run CHECK TABLE\n"
+		 "InnoDB: on your InnoDB tables to check that they are ok!\n"
+	   "InnoDB: Corrupt log record type %lu, space id %lu, page no %lu\n",
+			(ulint)(*type), *space, *page_no);
 
 		return(0);
 	}

innobase/row/row0ins.c

@@ -319,6 +319,7 @@ row_ins_dupl_error_with_rec(
 	ulint	matched_fields;
 	ulint	matched_bytes;
 	ulint	n_unique;
+	ulint   i;
 	
 	n_unique = dict_index_get_n_unique(index);
 
@@ -329,12 +330,26 @@ row_ins_dupl_error_with_rec(
 
 	if (matched_fields < n_unique) {
 
-			return(FALSE);
+	        return(FALSE);
+	}
+
+	/* In a unique secondary index we allow equal key values if they
+	contain SQL NULLs */
+
+	if (!(index->type & DICT_CLUSTERED)) {
+
+	        for (i = 0; i < n_unique; i++) {
+	                if (UNIV_SQL_NULL == dfield_get_len(
+                                         dtuple_get_nth_field(entry, i))) {
+
+	                        return(FALSE);
+	                }
+	        }
 	}
 
 	if (!rec_get_deleted_flag(rec)) {
 
-			return(TRUE);
+	        return(TRUE);
 	}
 
 	return(FALSE);