FetchHashKeyName emits invalid keys for utf8 fieldnames

Using DBI v 1.636

$dbi->{FetchHashKeyName}=’NAME_lc’ or NAME_uc apparently produces different keys from ‘lc’ and ‘uc’ functions for fieldnames containing non-ascii characters.

For example, ‘ämne-Abc’  with FetchHashKeyName=NAME_lc results in result key ‘\x{0}\x{0}mne-abc’

----
Summary of my perl5 (revision 5 version 24 subversion 0) configuration:

  Platform:
    osname=linux, osvers=2.6.32-642.6.2.el6.x86_64, archname=x86_64-linux
    uname='linux yonkyo.local 2.6.32-642.6.2.el6.x86_64 #1 smp wed oct 26 06:52:09 utc 2016 x86_64 x86_64 x86_64 gnulinux '
    config_args='-de -Dprefix=/opt/perlbrew/perls/perl-5.24.0 -Aeval:scriptdir=/opt/perlbrew/perls/perl-5.24.0/bin'
    hint=recommended, useposix=true, d_sigaction=define
    useithreads=undef, usemultiplicity=undef
    use64bitint=define, use64bitall=define, uselongdouble=undef
    usemymalloc=n, bincompat5005=undef
  Compiler:
    cc='cc', ccflags ='-fwrapv -fno-strict-aliasing -pipe -fstack-protector -I/usr/local/include -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 -D_FORTIFY_SOURCE=2',
    optimize='-O2',
    cppflags='-fwrapv -fno-strict-aliasing -pipe -fstack-protector -I/usr/local/include'
    ccversion='', gccversion='4.4.7 20120313 (Red Hat 4.4.7-17)', gccosandvers=''
    intsize=4, longsize=8, ptrsize=8, doublesize=8, byteorder=12345678, doublekind=3
    d_longlong=define, longlongsize=8, d_longdbl=define, longdblsize=16, longdblkind=3
    ivtype='long', ivsize=8, nvtype='double', nvsize=8, Off_t='off_t', lseeksize=8
    alignbytes=8, prototype=define
  Linker and Libraries:
    ld='cc', ldflags =' -fstack-protector -L/usr/local/lib'
    libpth=/usr/local/lib /usr/lib /lib/../lib64 /usr/lib/../lib64 /lib /lib64 /usr/lib64 /usr/local/lib64
    libs=-lpthread -lnsl -lgdbm -ldb -ldl -lm -lcrypt -lutil -lc
    perllibs=-lpthread -lnsl -ldl -lm -lcrypt -lutil -lc
    libc=libc-2.12.so, so=so, useshrplib=false, libperl=libperl.a
    gnulibc_version='2.12'
  Dynamic Linking:
    dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags='-Wl,-E'
    cccdlflags='-fPIC', lddlflags='-shared -O2 -L/usr/local/lib -fstack-protector'


Characteristics of this binary (from libperl):
  Compile-time options: HAS_TIMES PERLIO_LAYERS PERL_COPY_ON_WRITE
                        PERL_DONT_CREATE_GVSV
                        PERL_HASH_FUNC_ONE_AT_A_TIME_HARD PERL_MALLOC_WRAP
                        PERL_PRESERVE_IVUV USE_64_BIT_ALL USE_64_BIT_INT
                        USE_LARGE_FILES USE_LOCALE USE_LOCALE_COLLATE
                        USE_LOCALE_CTYPE USE_LOCALE_NUMERIC USE_LOCALE_TIME
                        USE_PERLIO USE_PERL_ATOF
  Locally applied patches:
        Devel::PatchPerl 1.42
  Built under linux
  Compiled at Nov  3 2016 12:25:49
  %ENV:
    PERLBREW_BASHRC_VERSION="0.75"
    PERLBREW_HOME="/home/chris/.perlbrew"
    PERLBREW_MANPATH="/opt/perlbrew/perls/perl-5.24.0/man"
    PERLBREW_PATH="/opt/perlbrew/bin:/opt/perlbrew/perls/perl-5.24.0/bin"
    PERLBREW_PERL="perl-5.24.0"
    PERLBREW_ROOT="/opt/perlbrew"
    PERLBREW_VERSION="0.75"
  @INC:
    /opt/perlbrew/perls/perl-5.24.0/lib/site_perl/5.24.0/x86_64-linux
    /opt/perlbrew/perls/perl-5.24.0/lib/site_perl/5.24.0
    /opt/perlbrew/perls/perl-5.24.0/lib/5.24.0/x86_64-linux
    /opt/perlbrew/perls/perl-5.24.0/lib/5.24.0
    .
---

Test case script
=====================================

use strict;
use utf8;
use Test::More tests => 26;
use Data::Dumper;

use DBI;

my $dbi=DBI->connect(
        'dbi:Pg:dbname=test_db',
        'chris',
        '',
        {
        pg_enable_utf8  =>  1,
        }
);

my @expect=(
    [ 'NAME', "ABc", "ABc" ],
    [ 'NAME_uc', "ABc", "ABC" ],
    [ 'NAME_lc', "ABc", "abc" ],

    [ 'NAME', "てすと-ABc", "てすと-ABc" ],
    [ 'NAME_uc', "てすと-Abc", "てすと-ABC" ],
    [ 'NAME_uc', "てすと-Abc", "てすと-ABC" ],
    [ 'NAME_lc', "てすと-Abc", "てすと-abc" ],
    [ 'NAME_lc', "てすと-Abc", "てすと-abc" ],

    [ 'NAME', "ÄMNE-Abc", "ÄMNE-Abc" ],
    [ 'NAME_uc', "ÄMNE-Abc", "ÄMNE-ABC" ],
    [ 'NAME_uc', "ämne-Abc", "ÄMNE-ABC" ],
    [ 'NAME_lc', "ämne-Abc", "ämne-abc" ],
    [ 'NAME_lc', "ÄMNE-Abc", "ämne-abc" ],
);

foreach my $e (@expect) {
    my($case,$as,$fld)=@$e;

    my $val;
    if($case eq 'NAME_uc') {
        $val = uc($as);
    } elsif($case eq 'NAME_lc') {
        $val = lc($as);
    } else {
        $val = $as;
    }

    is($val,$fld,"case-converted $as to $case");

    $dbi->{FetchHashKeyName} = $case;

    my $row=$dbi->selectrow_hashref(qq{ select now() as "$as" });

    ok(exists $row->{$fld},"hashref $case") or diag(Dumper $row);
}


Regards,
Chris Hutchinson