LP:998340 - Valgrind complains on simple selects containing expression DAY(FROM_UNIXTIME(-1))

SELECT SUBSTRING('1', DAY(FROM_UNIXTIME(-1)));

SELECT LEFT('1', DAY(FROM_UNIXTIME(-1)));

SELECT RIGHT('1', DAY(FROM_UNIXTIME(-1)));

SELECT REPEAT('1', DAY(FROM_UNIXTIME(-1)));

SELECT RPAD('hi', DAY(FROM_UNIXTIME(-1)),'?');

SELECT LPAD('hi', DAY(FROM_UNIXTIME(-1)),'?');

CREATE TABLE t1

SELECT SUBSTRING('1', DAY(FROM_UNIXTIME(-1))) AS f1,

       LEFT('1', DAY(FROM_UNIXTIME(-1))) AS f2,

       RIGHT('1', DAY(FROM_UNIXTIME(-1))) AS f3,

       REPEAT('1', DAY(FROM_UNIXTIME(-1))) AS f4,

       RPAD('hi', DAY(FROM_UNIXTIME(-1)),'?') AS f5,

       LPAD('hi', DAY(FROM_UNIXTIME(-1)),'?') AS f6;

SHOW CREATE TABLE t1;

DROP TABLE t1;

==24162== Conditional jump or move depends on uninitialised value(s)

==24162==    at 0x622A1A: Item_func_substr::fix_length_and_dec() (item_strfunc.cc:1273)

==24162==    by 0x5EF4B7: Item_func::fix_fields(THD*, Item**) (item_func.cc:205)

==24162==    by 0x61E3DA: Item_str_func::fix_fields(THD*, Item**) (item_strfunc.cc:67)

==24162==    by 0x70BE1B: setup_fields(THD*, Item**, List<Item>&, enum_mark_columns, List<Item>*, bool) (sql_base.cc:7714)

==24162==    by 0x71F07B: JOIN::prepare(Item***, TABLE_LIST*, unsigned int, Item*, unsigned int, st_order*, st_order*, Item*, st_order*, st_select_lex*, st_select_lex_unit*) (sql_select.cc:530)

==24162==    by 0x7268A7: mysql_select(THD*, Item***, TABLE_LIST*, unsigned int, List<Item>&, Item*, unsigned int, st_order*, st_order*, Item*, st_order*, unsigned long long, select_result*, st_select_lex_unit*, st_select_lex*) (sql_select.cc:2545)

==24162==    by 0x71E818: handle_select(THD*, st_lex*, select_result*, unsigned long) (sql_select.cc:280)

==24162==    by 0x6BD119: execute_sqlcom_select(THD*, TABLE_LIST*) (sql_parse.cc:5241)

==24162==    by 0x6B4232: mysql_execute_command(THD*) (sql_parse.cc:2380)

==24162==    by 0x6BF845: mysql_parse(THD*, char*, unsigned int, char const**) (sql_parse.cc:6216)

==24162==    by 0x6B1B30: dispatch_command(enum_server_command, THD*, char*, unsigned int) (sql_parse.cc:1294)

==24162==    by 0x6B0AE0: do_command(THD*) (sql_parse.cc:906)

==24162==    by 0x6AD563: handle_one_connection (sql_connect.cc:1208)

==24162==    by 0x5D16A4E: start_thread (in /lib64/libpthread-2.11.2.so)