Fix for bug#12053 LOAD DATA INFILE ignores NO_AUTO_VALUE_ON_ZERO setting

  set auto_increment_field_not_null to true to preserve zero values
  for autoincrement fields during LOAD DATA execution if 
  NO_AUTO_VALUE_ON_ZERO sql mode is set

mysql-test/r/loaddata.result

@@ -66,3 +66,13 @@ a	b
 3	row 3
 0	
 drop table t1;
+SET @OLD_SQL_MODE=@@SQL_MODE, @@SQL_MODE=NO_AUTO_VALUE_ON_ZERO;
+create table t1(id integer not null auto_increment primary key);
+insert into t1 values(0);
+select * from t1;
+id
+0
+select * from t1;
+id
+0
+SET @@SQL_MODE=@OLD_SQL_MODE;

mysql-test/t/loaddata.test

@@ -31,4 +31,31 @@ load data infile '../../std_data/loaddata4.dat' into table t1 fields terminated
 select * from t1;
 drop table t1;
 
+
+#
+# Bug #12053 LOAD DATA INFILE ignores NO_AUTO_VALUE_ON_ZERO setting
+#
+SET @OLD_SQL_MODE=@@SQL_MODE, @@SQL_MODE=NO_AUTO_VALUE_ON_ZERO;
+create table t1(id integer not null auto_increment primary key);
+insert into t1 values(0);
+disable_query_log;
+eval SELECT * INTO OUTFILE '$MYSQL_TEST_DIR/var/tmp/t1' from t1;
+delete from t1;
+eval load data infile '$MYSQL_TEST_DIR/var/tmp/t1' into table t1;
+enable_query_log;
+select * from t1;
+--exec rm $MYSQL_TEST_DIR/var/tmp/t1
+
+disable_query_log;
+eval SELECT * INTO OUTFILE '$MYSQL_TEST_DIR/var/tmp/t1'
+FIELDS TERMINATED BY '' OPTIONALLY ENCLOSED BY '' LINES TERMINATED BY '\r\n'
+FROM t1;
+delete from t1;
+eval load data infile '$MYSQL_TEST_DIR/var/tmp/t1' into table t1
+FIELDS TERMINATED BY '' OPTIONALLY ENCLOSED BY '' LINES TERMINATED BY '\r\n';
+enable_query_log;
+select * from t1;
+--exec rm $MYSQL_TEST_DIR/var/tmp/t1
+SET @@SQL_MODE=@OLD_SQL_MODE;
+
 # End of 4.1 tests

sql/sql_load.cc

@@ -429,6 +429,8 @@ read_fixed_length(THD *thd,COPY_INFO &info,TABLE *table,List<Item> &fields,
     while ((sql_field= (Item_field*) it++))
     {
       Field *field= sql_field->field;                  
+      if (field == table->next_number_field)
+        table->auto_increment_field_not_null= TRUE;
       if (pos == read_info.row_end)
       {
         thd->cuted_fields++;			/* Not enough fields */
@@ -520,6 +522,8 @@ read_sep_field(THD *thd,COPY_INFO &info,TABLE *table,
       length=(uint) (read_info.row_end-pos);
       Field *field=sql_field->field;
 
+      if (field == table->next_number_field)
+        table->auto_increment_field_not_null= TRUE;
       if (!read_info.enclosed &&
 	  (enclosed_length && length == 4 && !memcmp(pos,"NULL",4)) ||
 	  (length == 1 && read_info.found_null))