Bug#14729221 IN-PLACE ALTER TABLE REPORTS '' INSTEAD OF

REAL DUPLICATE VALUE FOR PREFIX KEYS

innobase_rec_to_mysql(): Invoke dict_index_get_nth_col_or_prefix_pos()
instead of dict_index_get_nth_col_pos() to find the column.

storage/innodb_plugin/ChangeLog

+2012-10-16	The InnoDB Team
+
+	* dict/dict0dict.c, handler/handler0alter.cc, include/dict0dict.h:
+	Fix Bug#14729221 IN-PLACE ALTER TABLE REPORTS '' INSTEAD OF REAL
+	DUPLICATE VALUE FOR PREFIX KEYS
+
 2012-10-09	The InnoDB Team
 
 	* row/row0mysql.c:

storage/innodb_plugin/dict/dict0dict.c

 /*****************************************************************************
 
-Copyright (c) 1996, 2011, Oracle and/or its affiliates. All Rights Reserved.
+Copyright (c) 1996, 2012, Oracle and/or its affiliates. All Rights Reserved.
 
 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
@@ -473,10 +473,12 @@ Looks for column n in an index.
 ULINT_UNDEFINED if not contained */
 UNIV_INTERN
 ulint
-dict_index_get_nth_col_pos(
-/*=======================*/
-	const dict_index_t*	index,	/*!< in: index */
-	ulint			n)	/*!< in: column number */
+dict_index_get_nth_col_or_prefix_pos(
+/*=================================*/
+	const dict_index_t*	index,		/*!< in: index */
+	ulint			n,		/*!< in: column number */
+	ibool			inc_prefix)	/*!< in: TRUE=consider
+						column prefixes too */
 {
 	const dict_field_t*	field;
 	const dict_col_t*	col;
@@ -498,7 +500,8 @@ dict_index_get_nth_col_pos(
 	for (pos = 0; pos < n_fields; pos++) {
 		field = dict_index_get_nth_field(index, pos);
 
-		if (col == field->col && field->prefix_len == 0) {
+		if (col == field->col
+		    && (inc_prefix || field->prefix_len == 0)) {
 
 			return(pos);
 		}
@@ -507,6 +510,20 @@ dict_index_get_nth_col_pos(
 	return(ULINT_UNDEFINED);
 }
 
+/********************************************************************//**
+Looks for column n in an index.
+@return position in internal representation of the index;
+ULINT_UNDEFINED if not contained */
+UNIV_INTERN
+ulint
+dict_index_get_nth_col_pos(
+/*=======================*/
+	const dict_index_t*	index,	/*!< in: index */
+	ulint			n)	/*!< in: column number */
+{
+	return(dict_index_get_nth_col_or_prefix_pos(index, n, FALSE));
+}
+
 #ifndef UNIV_HOTBACKUP
 /********************************************************************//**
 Returns TRUE if the index contains a column or a prefix of that column.

storage/innodb_plugin/handler/handler0alter.cc

@@ -147,7 +147,7 @@ innobase_rec_to_mysql(
 
 		field->reset();
 
-		ipos = dict_index_get_nth_col_pos(index, i);
+		ipos = dict_index_get_nth_col_or_prefix_pos(index, i, TRUE);
 
 		if (UNIV_UNLIKELY(ipos == ULINT_UNDEFINED)) {
 null_field:

storage/innodb_plugin/include/dict0dict.h

@@ -839,6 +839,18 @@ dict_index_get_nth_col_pos(
 	const dict_index_t*	index,	/*!< in: index */
 	ulint			n);	/*!< in: column number */
 /********************************************************************//**
+Looks for column n in an index.
+@return position in internal representation of the index;
+ULINT_UNDEFINED if not contained */
+UNIV_INTERN
+ulint
+dict_index_get_nth_col_or_prefix_pos(
+/*=================================*/
+	const dict_index_t*	index,		/*!< in: index */
+	ulint			n,		/*!< in: column number */
+	ibool			inc_prefix);	/*!< in: TRUE=consider
+						column prefixes too */
+/********************************************************************//**
 Returns TRUE if the index contains a column or a prefix of that column.
 @return	TRUE if contains the column or its prefix */
 UNIV_INTERN