[tarantool-patches] Re: [PATCH v2 1/3] sql: introduce pragma sql_default_engine

["n.pettik" <korablev@tarantool.org>]

These inputs leads to segfault:

box.cfg{}
\set language sql
pragma  sql_default_engine

Segmentation fault
  code: SEGV_MAPERR
  addr: 0x0
  context: 0x10701ee08
  siginfo: 0x10701eda0
Current time: 1530280267
Please file a bug at http://github.com/tarantool/tarantool/issues
Attempting backtrace... Note: since the server has already crashed, 
this may fail as well
#0  0x1046152cd in print_backtrace+d
#1  0x1044cdbb3 in _ZL12sig_fatal_cbiP9__siginfoPv+1f3
#2  0x7fffea9eab3a in _sigtramp+1a
#3  0x7fffea86c43c in strcasecmp_l+5a
#4  0x104630509 in strindex+69
#5  0x10487b214 in sql_default_engine_set+24
#6  0x10487a979 in sqlite3Pragma+1b69
#7  0x1048333f2 in yy_reduce+3072
#8  0x10482fdfa in sqlite3Parser+11a
#9  0x10489701d in sqlite3RunParser+43d
#10 0x10487cc10 in sqlite3Prepare+170
#11 0x10487c643 in sqlite3LockAndPrepare+83
#12 0x10487c73f in sqlite3_prepare_v2+4f
#13 0x1045e8fe2 in lua_sql_execute+92
#14 0x104642eed in lj_BC_FUNCC+44
#15 0x104671540 in lua_pcall+210
#16 0x1045f9bd3 in luaT_call+23
#17 0x1045f0b11 in lua_main+d1
#18 0x1045f08f8 in run_script_f+8e8
#19 0x1044cd4aa in _ZL16fiber_cxx_invokePFiP13__va_list_tagES0_+1a
#20 0x104610dbb in fiber_loop+bb
#21 0x10482f827 in coro_init+57

Also, it reproduces with:

pragma sql_default_engine 1

pragma sql_default_engine ‘memtx’ 

Some pragmas support such syntax, so lets handle this situation
in a polite way.

Moreover, simple ‘pragma’ command displays list of available pragmas and
their statuses. Lets add ’sql_default_engine’ to that list.