Re: pgbench - test whether a variable exists

The following review has been posted through the commitfest application:
make installcheck-world: not tested
Implements feature: not tested
Spec compliant: tested, failed
Documentation: not tested

I am not very convinced to have that, but I have performed some testing on master ().

I found a crash

[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
Core was generated by `pgbench postgres -T 60 -f a.sql'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0 0x000055bfb572a4b2 in expr_yylex (yylval_param=0x7fff29a60870, yyscanner=0x55bfb6867a90) at exprscan.c:1107
1107 *yy_cp = yyg->yy_hold_char;
(gdb) bt
#0 0x000055bfb572a4b2 in expr_yylex (yylval_param=0x7fff29a60870, yyscanner=0x55bfb6867a90) at exprscan.c:1107
#1 0x000055bfb572cb63 in expr_lex_one_word (state=0x55bfb6867a10, word_buf=0x7fff29a608d0, offset=0x7fff29a608a8) at exprscan.l:340
#2 0x000055bfb57358fd in process_backslash_command (sstate=0x55bfb6867a10, source=0x55bfb68653a0 "a.sql") at pgbench.c:4540
#3 0x000055bfb5736528 in ParseScript (
script=0x55bfb68655f0 "\\set nbranches :scale\n\\set ntellers 10 * :scale\n\\set naccounts 100000 * :scale\n\\setrandom aid 1 :naccounts\n\\setrandom bid 1 :nbranches\n\\setrandom tid 1 :ntellers\n\\setrandom delta -5000 5000\nBEGIN;\nUPD"..., desc=0x55bfb68653a0 "a.sql", weight=1) at pgbench.c:4826
#4 0x000055bfb5736967 in process_file (filename=0x55bfb68653a0 "a.sql", weight=1) at pgbench.c:4962
#5 0x000055bfb5738628 in main (argc=6, argv=0x7fff29a610d8) at pgbench.c:5641

The new status of this patch is: Waiting on Author