Second crash with select_describe with nested subqueries in maria-5.3

[Philip Stoev]

Repeatable with any optimizer_switch setting.

backtrace:

#4 0x000000000074feb8 in select_describe (join=0x1f0d16e0, need_tmp_table=true, need_order=false, distinct=false, message=0x0) at sql_select.cc:20506
#5 0x0000000000752b86 in JOIN::exec (this=0x1f0d16e0) at sql_select.cc:2179
#6 0x000000000074e95a in mysql_select (thd=0x1efb8068, rref_pointer_array=0x1f03f998, tables=0x1f072ab8, wild_num=0, fields=..., conds=0x0, og_num=0,
    order=0x0, group=0x0, having=0x0, proc_param=0x0, select_options=2147764741, result=0x1f073320, unit=0x1f0725d0, select_lex=0x1f03f778)
    at sql_select.cc:2889
#7 0x000000000074ecff in mysql_explain_union (thd=0x1efb8068, unit=0x1f0725d0, result=0x1f073320) at sql_select.cc:20978
#8 0x0000000000751cdb in select_describe (join=0x1f0cb4b0, need_tmp_table=false, need_order=false, distinct=false, message=0x0) at sql_select.cc:20935
#9 0x0000000000752b86 in JOIN::exec (this=0x1f0cb4b0) at sql_select.cc:2179
#10 0x000000000074e95a in mysql_select (thd=0x1efb8068, rref_pointer_array=0x1f03eaa0, tables=0x1f03f388, wild_num=0, fields=..., conds=0x1f072e90,
    og_num=0, order=0x0, group=0x0, having=0x0, proc_param=0x0, select_options=2147764740, result=0x1f073320, unit=0x1f03eb90, select_lex=0x1f03e880)
    at sql_select.cc:2889
#11 0x000000000074ecff in mysql_explain_union (thd=0x1efb8068, unit=0x1f03eb90, result=0x1f073320) at sql_select.cc:20978
#12 0x0000000000751cdb in select_describe (join=0x1f0c5280, need_tmp_table=false, need_order=false, distinct=false,
    message=0xd924a0 "Impossible WHERE noticed after reading const tables") at sql_select.cc:20935
#13 0x0000000000751dd9 in return_zero_rows (join=0x1f0c5280, result=0x1f073320, tables=..., fields=..., send_row=false, select_options=2147764740,
    info=0xd924a0 "Impossible WHERE noticed after reading const tables", having=0x0) at sql_select.cc:10106
#14 0x0000000000752734 in JOIN::exec (this=0x1f0c5280) at sql_select.cc:2120
#15 0x000000000074e95a in mysql_select (thd=0x1efb8068, rref_pointer_array=0x1efbac18, tables=0x1f03df58, wild_num=1, fields=..., conds=0x1f073120,
    og_num=0, order=0x0, group=0x0, having=0x0, proc_param=0x0, select_options=2147764740, result=0x1f073320, unit=0x1efba510, select_lex=0x1efba9f8)
    at sql_select.cc:2889
#16 0x000000000074ecff in mysql_explain_union (thd=0x1efb8068, unit=0x1efba510, result=0x1f073320) at sql_select.cc:20978
#17 0x00000000006a18c2 in execute_sqlcom_select (thd=0x1efb8068, all_tables=0x1f03df58) at sql_parse.cc:5066
#18 0x00000000006a373a in mysql_execute_command (thd=0x1efb8068) at sql_parse.cc:2231
#19 0x00000000006ac4d3 in mysql_parse (thd=0x1efb8068,
    rawbuf=0x1f03dcb0 "EXPLAIN SELECT * \nFROM t2, t3\nWHERE t3.f1 = (\nSELECT SUM( f2 )\nFROM t4\nWHERE EXISTS (\nSELECT DISTINCT f4\nFROM t1\n)\n)",
    length=116, found_semicolon=0x41427f08) at sql_parse.cc:6088
#20 0x00000000006ad36b in dispatch_command (command=COM_QUERY, thd=0x1efb8068, packet=0x1f034939 "", packet_length=116) at sql_parse.cc:1208
#21 0x00000000006ae979 in do_command (thd=0x1efb8068) at sql_parse.cc:906
#22 0x00000000006993ef in handle_one_connection (arg=0x1efb8068) at sql_connect.cc:1178
#23 0x00000033b600673d in start_thread () from /lib64/libpthread.so.0
#24 0x00000033b58d40cd in clone () from /lib64/libc.so.6

full optimizer switch:

index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=off,index_condition_pushdown=on,derived_merge=on,derived_with_keys=on,firstmatch=off,loosescan=off,materialization=off,in_to_exists=on,semijoin=off,partial_match_rowid_merge=on,partial_match_table_scan=on,subquery_cache=on,mrr=on,mrr_cost_based=off,mrr_sort_keys=on,outer_join_with_cache=off,semijoin_with_cache=off,join_cache_incremental=on,join_cache_hashed=on,join_cache_bka=on,optimize_join_buffer_size=on,table_elimination=on

test case:

CREATE TABLE t1 ( f4 int) ;
INSERT INTO t1 VALUES (0),(0);

CREATE TABLE t2 ( f2 int) ;

CREATE TABLE t3 ( f1 int NOT NULL );

CREATE TABLE t4 ( f2 int, f3 int) ;
INSERT INTO t4 VALUES (8,0),(3,0);

SELECT @@optimizer_switch;

EXPLAIN SELECT *
FROM t2, t3
WHERE t3.f1 = (
        SELECT SUM( f2 )
        FROM t4
        WHERE EXISTS (
                SELECT DISTINCT f4
                FROM t1
        )
);