added code covarage for functions convert(), nullif(), crc32(), is_used_lock(), char_lengtrh(), bit_xor()

added string length for more speed
made code covarage for print() method of Item
fixed printability of some items (SCRUM) (WL#1274)


mysql-test/r/auto_increment.result:
  print() code coverage
mysql-test/r/bench_count_distinct.result:
  print() code coverage
mysql-test/r/case.result:
  print() code coverage
mysql-test/r/cast.result:
  print() code coverage
mysql-test/r/ctype_collate.result:
  print() code coverage
mysql-test/r/ctype_many.result:
  convert with 3 arguments code covarage
  print() code coverage
mysql-test/r/ctype_utf8.result:
  char_length code coverage
mysql-test/r/date_formats.result:
  print() code coverage
mysql-test/r/fulltext.result:
  print() code coverage
mysql-test/r/func_compress.result:
  print() code coverage
mysql-test/r/func_gconcat.result:
  print() code coverage
mysql-test/r/func_group.result:
  bit_xor() code coverage
  print() code coverage
mysql-test/r/func_if.result:
  nullif() code coverage
  print() code coverage
mysql-test/r/func_in.result:
  print() code coverage
mysql-test/r/func_math.result:
  print() code coverage
mysql-test/r/func_op.result:
  print() code coverage
mysql-test/r/func_regexp.result:
  print() code coverage
mysql-test/r/func_set.result:
  print() code coverage
mysql-test/r/func_str.result:
  crc32() code coverage
  print() code coverage
mysql-test/r/func_system.result:
  print() code coverage
mysql-test/r/func_test.result:
  print() code coverage
mysql-test/r/func_time.result:
  print() code coverage
mysql-test/r/group_by.result:
  print() code coverage
mysql-test/r/having.result:
  print() code coverage
mysql-test/r/insert_update.result:
  print() code coverage
mysql-test/r/null.result:
  print() code coverage
mysql-test/r/olap.result:
  print() code coverage
mysql-test/r/query_cache.result:
  print() code coverage
mysql-test/r/row.result:
  print() code coverage
mysql-test/r/rpl000001.result:
  print() code coverage
mysql-test/r/rpl_get_lock.result:
  print() code coverage
mysql-test/r/rpl_master_pos_wait.result:
  print() code coverage
mysql-test/r/select.result:
  print() code coverage
mysql-test/r/subselect.result:
  print() code coverage
mysql-test/r/type_blob.result:
  print() code coverage
mysql-test/r/varbinary.result:
  print() code coverage
mysql-test/r/variables.result:
  print() code coverage
mysql-test/t/auto_increment.test:
  print() code coverage
mysql-test/t/bench_count_distinct.test:
  print() code coverage
mysql-test/t/case.test:
  print() code coverage
mysql-test/t/cast.test:
  print() code coverage
mysql-test/t/ctype_collate.test:
  print() code coverage
mysql-test/t/ctype_many.test:
  convert with 3 arguments code covarage
  print() code coverage
mysql-test/t/ctype_utf8.test:
  char_length code coverage
mysql-test/t/date_formats.test:
  print() code coverage
mysql-test/t/fulltext.test:
  print() code coverage
mysql-test/t/func_compress.test:
  print() code coverage
mysql-test/t/func_gconcat.test:
  print() code coverage
mysql-test/t/func_group.test:
  bit_xor() code coverage
  print() code coverage
mysql-test/t/func_if.test:
  nullif() code coverage
  print() code coverage
mysql-test/t/func_in.test:
  print() code coverage
mysql-test/t/func_math.test:
  print() code coverage
mysql-test/t/func_op.test:
  print() code coverage
mysql-test/t/func_regexp.test:
  print() code coverage
mysql-test/t/func_set.test:
  print() code coverage
mysql-test/t/func_str.test:
  crc32() code covarage
  print() code coverage
mysql-test/t/func_system.test:
  print() code coverage
mysql-test/t/func_test.test:
  print() code coverage
mysql-test/t/func_time.test:
  print() code coverage
mysql-test/t/group_by.test:
  print() code coverage
mysql-test/t/having.test:
  print() code coverage
mysql-test/t/insert_update.test:
  print() code coverage
mysql-test/t/null.test:
  print() code coverage
mysql-test/t/olap.test:
  print() code coverage
mysql-test/t/query_cache.test:
  print() code coverage
mysql-test/t/row.test:
  print() code coverage
mysql-test/t/rpl000001.test:
  print() code coverage
mysql-test/t/rpl_get_lock.test:
  print() code coverage
mysql-test/t/rpl_master_pos_wait.test:
  print() code coverage
mysql-test/t/select.test:
  print() code coverage
mysql-test/t/type_blob.test:
  print() code coverage
mysql-test/t/varbinary.test:
  print() code coverage
mysql-test/t/variables.test:
  print() code coverage
sql/item.cc:
  added string length for more speed
  layout fix
  fixed string printability
sql/item.h:
  added string length for more speed
sql/item_cmpfunc.cc:
  added string length for more speed
sql/item_cmpfunc.h:
  fixed printability
sql/item_create.cc:
  fixed printability
sql/item_func.cc:
  fixed printability
  added string length for more speed
sql/item_func.h:
  fixed printability
sql/item_strfunc.cc:
  fixed printability
  added string length for more speed
sql/item_strfunc.h:
  fixed printability
sql/item_subselect.cc:
  added string length for more speed
sql/item_sum.cc:
  added string length for more speed
sql/item_timefunc.cc:
  added string length for more speed
sql/item_timefunc.h:
  fixed printability
sql/item_uniq.h:
  added string length for more speed
sql/key.cc:
  added string length for more speed
sql/sql_lex.cc:
  added string length for more speed
sql/sql_parse.cc:
  after merge fix
sql/sql_repl.cc:
  string changed with character for more speed
sql/sql_select.cc:
  added string length for more speed
sql/sql_show.cc:
  added string length for more speed

mysql-test/t/variables.test

@@ -16,6 +16,7 @@ select @test_int,@test_double,@test_string,@test_string2;
 set @test_int=null,@test_double=null,@test_string=null,@test_string2=null;
 select @test_int,@test_double,@test_string,@test_string2;
 select @t1:=(@t2:=1)+@t3:=4,@t1,@t2,@t3;
+explain extended select @t1:=(@t2:=1)+@t3:=4,@t1,@t2,@t3;
 select @t5;
 
 #
@@ -52,7 +53,9 @@ select @@local.max_join_size, @@global.max_join_size;
 select @@identity,  length(@@version)>0;
 select @@VERSION=version();
 select last_insert_id(345);
+explain extended select last_insert_id(345);
 select @@IDENTITY,last_insert_id(), @@identity;
+explain extended select @@IDENTITY,last_insert_id(), @@identity;
 
 set big_tables=OFF, big_tables=ON, big_tables=0, big_tables=1, big_tables="OFF", big_tables="ON";