Why is selectrow_hashref complaining about a fetch without execute?

DBIers,

Got a complaint about a “fetch() without execute()” error. Asked for a trace, got this. Looks like it’s coming from selectrow_hashref()? That shouldn’t happen, right?

> $ DBI_TRACE=1 sqitch status
>     DBI 1.630-ithread default trace level set to 0x0/1 (pid 3381 pi ed2010) at DBI.pm line 288 via DBIEngine.pm line 7
> # On database sqitch_testing
>     -> DBI->connect(dbi:mysql:database=sqitch, root, ****, HASH(0x2b00a28))
>     -> DBI->install_driver(mysql) for linux perl=5.018002 pid=3381 ruid=1000 euid=1000
>        install_driver: DBD::mysql version 4.031 loaded from /usr/local/lib/perl/5.18.2/DBD/mysql.pm
>     <- install_driver= DBI::dr=HASH(0x1c118e8)
>     !! The warn '0' was CLEARED by call to connect method
>     <- connect('database=sqitch', 'root', ...)= ( DBI::db=HASH(0x2b9eac0) ) [1 items] at DBI.pm line 671
>     <- STORE('RaiseError', 0)= ( 1 ) [1 items] at DBI.pm line 723
>     <- STORE('PrintError', 0)= ( 1 ) [1 items] at DBI.pm line 723
>     <- STORE('AutoCommit', 1)= ( 1 ) [1 items] at DBI.pm line 723
>     <- STORE('HandleError', CODE(0x278aa80))= ( 1 ) [1 items] at DBI.pm line 726
>     <- STORE('mysql_auto_reconnect', 0)= ( 1 ) [1 items] at DBI.pm line 726
>     <- STORE('Callbacks', HASH(0x2ae94d0))= ( 1 ) [1 items] at DBI.pm line 726
>     <- STORE('mysql_enable_utf8', 1)= ( 1 ) [1 items] at DBI.pm line 726
>     <- STORE('mysql_use_result', 0)= ( 1 ) [1 items] at DBI.pm line 726
>     <- STORE('Username', 'root')= ( 1 ) [1 items] at DBI.pm line 726
>     {{ connected callback CODE(0x278ac78) being invoked
>     }} connected callback CODE(0x278ac78) returned
>     <- connected('dbi:mysql:database=sqitch', 'root', ...)= ( undef ) [1 items] at DBI.pm line 733
>     <- connect= DBI::db=HASH(0x2b9eac0)
>     <- STORE('dbi_connect_closure', CODE(0x1c11b10))= ( 1 ) [1 items] at DBI.pm line 742
>     <- FETCH('mysql_serverinfo')= ( '5.6.17-0ubuntu0.14.04.1-log' ) [1 items] at mysql.pm line 106
>     <- FETCH('mysql_serverversion')= ( '50617' ) [1 items] at mysql.pm line 109
>     !! The ERROR '1038' was CLEARED by call to fetchrow_hashref method
>     !! The ERROR '4' was CLEARED by call to fetch method
>        ERROR: 19 'fetch() without execute()' (err#0)
>     <- DESTROY(DBI::st=HASH(0x2ae9638))= ( undef ) [1 items] at DBI.pm line 1639
>     !! ERROR: 19 'fetch() without execute()' (err#0)
>     <- selectrow_hashref('
>         SELECT c.change_id
>              , c.script_hash
>                  , c.change
>              , c.project
>              , c.note
>              , c.committer_name
>              , c.committer_email
>              , date_format(c.committed_at, 'year:%Y:month:%m:day:%d:hour:%H:minute:%i:second:%S:time_zone:UTC') AS committed_at
>              , c.planner_name
>              , c.planner_email
>              , date_format(c.planned_at, 'year:%Y:month:%m:day:%d:hour:%H:minute:%i:second:%S:time_zone:UTC') AS planned_at
>              , group_concat(t.tag SEPARATOR ' ') AS tags
>           FROM changes   c
>           LEFT JOIN tags t ON c.change_id = t.change_id
>          WHERE c.project = ?
>          GROUP BY c.change_id
>              , c.script_hash
>                  , c.change
>              , c.project
>              , c.note
>              , c.committer_name
>              , c.committer_email
>              , c.committed_at
>              , c.planner_name
>              , c.planner_email
>              , c.planned_a...', undef, ...)= ( undef ) [1 items] at DBIEngine.pm line 116
>     -> HandleError on DBI::db=HASH(0x2b9ea48) via CODE(0x278aa80) (undef)
>     <- $DBI::state= 'S1000'
>     <- $DBI::state= 'S1000'
>     <- $DBI::state= 'S1000'
>     <- $DBI::state= 'S1000'
>     <- $DBI::state= 'S1000'
>     !! The ERROR '19' was CLEARED by call to selectcol_arrayref method
>     <- DESTROY(DBI::st=HASH(0x2ae94b8))= ( undef ) [1 items] at mysql.pm line 218
>     <- selectcol_arrayref('
>         SELECT COUNT(*)
>           FROM information_schema.tables
>          WHERE table_schema = ?
>            AND table_name   = ?
>     ', undef, ...)= ( [ '1' ] ) [1 items] at mysql.pm line 218
>     <- DESTROY(DBI::db=HASH(0x2b9ea48))= ( undef ) [1 items] at Tiny.pm line 88
> fetch() without execute()
>     <- disconnect_all= ( ) [0 items] (not implemented) at DBI.pm line 750
> !   <- DESTROY(DBI::dr=HASH(0x1c119a8))= ( undef ) [1 items] during global destruction
Thanks,

David