added test for bug #2290 "output truncated with ELT when using DISTINCT"

sql/item_strfunc.cc:
  fixed bug #2290 "output truncated with ELT when using DISTINCT"

mysql-test/r/func_str.result

@@ -266,3 +266,10 @@ CONCAT("</a>",RPAD("",(55 - LENGTH(title)),"."))
 NULL
 </a>..........................
 DROP TABLE t1;
+CREATE TABLE t1 (i int, j int);
+INSERT INTO t1 VALUES (1,1),(2,2);
+SELECT DISTINCT i, ELT(j, '345', '34') FROM t1;
+i	ELT(j, '345', '34')
+1	345
+2	34
+DROP TABLE t1;

mysql-test/t/func_str.test

@@ -154,3 +154,12 @@ INSERT INTO t1 VALUES ('House passes the CAREERS bill');
 SELECT CONCAT("</a>",RPAD("",(55 - LENGTH(title)),".")) from t1;
 
 DROP TABLE t1;
+
+#
+# test for Bug #2290 "output truncated with ELT when using DISTINCT"
+#
+
+CREATE TABLE t1 (i int, j int);
+INSERT INTO t1 VALUES (1,1),(2,2);
+SELECT DISTINCT i, ELT(j, '345', '34') FROM t1;
+DROP TABLE t1;
\ No newline at end of file

sql/item_strfunc.cc

@@ -1507,7 +1507,7 @@ void Item_func_elt::fix_length_and_dec()
 {
   max_length=0;
   decimals=0;
-  for (uint i=1 ; i < arg_count ; i++)
+  for (uint i= 0; i < arg_count ; i++) // first number argument isn't in list!
   {
     set_if_bigger(max_length,args[i]->max_length);
     set_if_bigger(decimals,args[i]->decimals);