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Add RowChecksum::get_crc_args().

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This commit is contained in:
Daniel Nichter
2011-09-12 10:29:26 -06:00
parent 0f05ca9b94
commit e2282b0f9e
1 changed files with 21 additions and 12 deletions
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33
lib/RowChecksum.pm
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@@ -178,22 +178,19 @@ sub make_chunk_checksum {
if ( !$args{dbh} && !($args{func} && $args{crc_width} && $args{crc_type}) ) {
die "I need a dbh argument"
}
my ($tbl) = @args{@required_args};
my $o = $self->{OptionParser};
my $q = $self->{Quoter};
my $o = $self->{OptionParser};
my $q = $self->{Quoter};
my $func = $args{func} || $self->_get_hash_func(%args);
my $crc_width = $args{crc_width}|| $self->_get_crc_width(%args, func=>$func);
my $crc_type = $args{crc_type} || $self->_get_crc_type(%args, func=>$func);
my %crc_args = $self->get_crc_args(%args);
my $opt_slice;
if ( $o->get('optimize-xor') ) {
if ( $crc_type !~ m/int$/ ) {
$opt_slice = $self->_optimize_xor(%args, func => $func);
if ( $crc_args{crc_type} !~ m/int$/ ) {
$opt_slice = $self->_optimize_xor(%args, %crc_args);
warn "Cannot use --optimize-xor" unless defined $opt_slice;
}
}
MKDEBUG && _d("Checksum strat:", $func, $crc_width, $crc_type, $opt_slice);
MKDEBUG && _d("Checksum strat:", Dumper(\%crc_args));
# This checksum algorithm concatenates the columns in each row and
# checksums them, then slices this checksum up into 16-character chunks.
@@ -208,18 +205,18 @@ sub make_chunk_checksum {
# can be fed right into BIT_XOR after a cast to UNSIGNED.
my $row_checksum = $self->make_row_checksum(
%args,
func => $func,
%crc_args,
no_cols => 1
);
my $crc;
if ( $crc_type =~ m/int$/ ) {
if ( $crc_args{crc_type} =~ m/int$/ ) {
$crc = "COALESCE(LOWER(CONV(BIT_XOR(CAST($row_checksum AS UNSIGNED)), "
. "10, 16)), 0)";
}
else {
my $slices = $self->_make_xor_slices(
row_checksum => $row_checksum,
crc_width => $crc_width
%crc_args,
);
$crc = "COALESCE(LOWER(CONCAT($slices)), 0)";
}
@@ -229,6 +226,18 @@ sub make_chunk_checksum {
return $select;
}
sub get_crc_args {
my ($self, %args) = @_;
my $func = $args{func} || $self->_get_hash_func(%args);
my $crc_width = $args{crc_width}|| $self->_get_crc_width(%args, func=>$func);
my $crc_type = $args{crc_type} || $self->_get_crc_type(%args, func=>$func);
return (
func => $func,
crc_width => $crc_width,
crc_type => $crc_type,
);
}
# Sub: _get_hash_func
# Get the fastest available hash function.
#