Drizzle client hash completion generates SQL errors

[Andrew Hutchings]

Whilst breaking on "my_printf_error" I accidentally found that the drizzle client's hash completion generator routine is getting SQL errors on:

show fields in 't2'

But silently hiding them.

Backtrace on Drizzle server side:

#0 drizzled::my_printf_error (error=1064,
    format=0xd1aba8 "%s near '%-.80s' at line %d", MyFlags=0)
    at drizzled/error.cc:152
#1 0x000000000068c1da in DRIZZLEparse (yysession=0x1840c10)
    at drizzled/sql_yacc.cc:17758
#2 0x000000000066b3fc in parse_sql (session=0x1840c10,
    inBuf=0x184b028 "show fields in 't2'", length=19)
    at drizzled/sql_parse.cc:1773
#3 drizzled::mysql_parse (session=0x1840c10,
    inBuf=0x184b028 "show fields in 't2'", length=19)
    at drizzled/sql_parse.cc:738
#4 0x000000000066d8aa in drizzled::dispatch_command (
    command=<value optimised out>, session=0x1840c10,
    packet=0x183cc01 "show fields in 't2'",
    packet_length=<value optimised out>) at drizzled/sql_parse.cc:228
#5 0x0000000000645b2a in drizzled::Session::executeStatement (this=0x1840c10)
    at drizzled/session.cc:704
#6 0x000000000064b35f in drizzled::Session::run (this=0x1840c10)
    at drizzled/session.cc:547
#7 0x00007ffff18aa94b in MultiThreadScheduler::runSession (this=0x181c660,
    session=0x1840c10) at plugin/multi_thread/multi_thread.cc:50
#8 0x00007ffff6b698e0 in thread_proxy ()
   from /usr/lib/libboost_thread.so.1.44.0
#9 0x00007ffff543d971 in start_thread (arg=<value optimised out>)
    at pthread_create.c:304
#10 0x00007ffff519994d in clone ()
    at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#11 0x0000000000000000 in ?? ()