bk commit into 5.1 tree (evgen:1.2229) BUG#11228

[eugene]

Below is the list of changes that have just been committed into a local
5.1 repository of evgen. When evgen does a push these changes will
be propagated to the main repository and, within 24 hours after the
push, to the public repository.
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see http://dev.mysql.com/doc/mysql/en/installing-source-tree.html

ChangeSet
  1.2229 06/07/01 01:37:20 evgen@stripped +3 -0
  Reverted wrong bug fix (Bug#11228)

  sql/table.cc
    1.226 06/07/01 01:36:04 evgen@stripped +21 -0
    Reverted wrong bug fix.
    The intention with the original code was to show that MySQL treats the first
    given unique key as a primary key. Clients can use the marked primary key as a
    real primary key to validate row changes in case of conflicting updates.  The
    ODBC driver (and other drivers) may also use this fact to optimize/check
    updates and handle conflicts.  The marked key also shows what some engines, like InnoDB or NDB,
    will use as it's internal primary key.
    For checking if someone has declared a true PRIMARY KEY, one should use 'SHOW CREATE TABLE'

  mysql-test/r/key.result
    1.36 06/07/01 01:34:16 evgen@stripped +9 -1
    Fixed result after removing wrong bug fix

  mysql-test/t/key.test
    1.28 06/07/01 01:33:39 evgen@stripped +1 -0
    Added SHOW CREATE TABLE, which is the proper way to check for table definitions

# This is a BitKeeper patch.  What follows are the unified diffs for the
# set of deltas contained in the patch.  The rest of the patch, the part
# that BitKeeper cares about, is below these diffs.
# User:	evgen
# Host:	moonbone.local
# Root:	/work/merge-5.1

--- 1.225/sql/table.cc	2006-06-30 16:08:18 +04:00
+++ 1.226/sql/table.cc	2006-07-01 01:36:04 +04:00
@@ -1025,6 +1025,27 @@
       if (share->key_info[key].flags & HA_FULLTEXT)
 	share->key_info[key].algorithm= HA_KEY_ALG_FULLTEXT;
 
+      if (primary_key >= MAX_KEY && (keyinfo->flags & HA_NOSAME))
+      {
+	/*
+	  If the UNIQUE key doesn't have NULL columns and is not a part key
+	  declare this as a primary key.
+	*/
+	primary_key=key;
+	for (i=0 ; i < keyinfo->key_parts ;i++)
+	{
+	  uint fieldnr= key_part[i].fieldnr;
+	  if (!fieldnr ||
+	      share->field[fieldnr-1]->null_ptr ||
+	      share->field[fieldnr-1]->key_length() !=
+	      key_part[i].length)
+	  {
+	    primary_key=MAX_KEY;		// Can't be used
+	    break;
+	  }
+	}
+      }
+
       for (i=0 ; i < keyinfo->key_parts ; key_part++,i++)
       {
         Field *field;

--- 1.35/mysql-test/r/key.result	2006-06-30 16:08:16 +04:00
+++ 1.36/mysql-test/r/key.result	2006-07-01 01:34:16 +04:00
@@ -336,8 +336,16 @@
 UNIQUE i2idx (i2));
 desc t1;
 Field	Type	Null	Key	Default	Extra
-i1	int(11)	NO	UNI		
+i1	int(11)	NO	PRI		
 i2	int(11)	NO	UNI		
+show create table t1;
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `i1` int(11) NOT NULL,
+  `i2` int(11) NOT NULL,
+  UNIQUE KEY `i1idx` (`i1`),
+  UNIQUE KEY `i2idx` (`i2`)
+) ENGINE=MyISAM DEFAULT CHARSET=latin1
 drop table t1;
 create table t1 (
 c1 int,

--- 1.27/mysql-test/t/key.test	2006-06-30 16:08:16 +04:00
+++ 1.28/mysql-test/t/key.test	2006-07-01 01:33:39 +04:00
@@ -334,6 +334,7 @@
  UNIQUE i1idx (i1),
  UNIQUE i2idx (i2));
 desc t1;
+show create table t1;
 drop table t1;
 
 #