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DoC: fix slow path of filter_by_negation when columns are repeated in tgt relation

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Signed-off-by: Nuno Lopes <a-nlopes@microsoft.com>
This commit is contained in:
Nuno Lopes 2014-10-02 09:56:06 +01:00
parent bb15ddbf15
commit 9828b26379
3 changed files with 53 additions and 8 deletions
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25
src/muz/rel/udoc_relation.cpp
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@ -1110,11 +1110,16 @@ namespace datalog {
for (unsigned i = 0; i < neg.size(); ++i) {
doc& neg_i = neg[i];
doc_ref newD(dmt, dmt.allocateX());
copy_columns(newD->pos(), neg_i.pos(), t, n);
if (!copy_columns(newD->pos(), neg_i.pos(), t, n))
continue;
bool is_empty = false;
for (unsigned j = 0; !is_empty && j < neg_i.neg().size(); ++j) {
tbv_ref newT(dmt.tbvm(), dmt.tbvm().allocateX());
copy_columns(*newT, neg_i.neg()[j], t, n);
if (!copy_columns(*newT, neg_i.neg()[j], t, n) ||
!dmt.tbvm().set_and(*newT, newD->pos())) {
continue;
}
if (dmt.tbvm().equals(newD->pos(), *newT)) {
is_empty = true;
}
@ -1139,17 +1144,19 @@ namespace datalog {
renamed_neg.reset(dmt);
IF_VERBOSE(3, tb.display(verbose_stream() << "slow case:"););
}
void copy_columns(
bool copy_columns(
tbv& dst, tbv const& src,
udoc_relation const& dstt,
udoc_relation const& srct)
{
unsigned num_cols = m_t_cols.size();
for (unsigned i = 0; i < num_cols; ++i) {
copy_column(dst, src, m_t_cols[i], m_neg_cols[i], dstt, srct);
if (!copy_column(dst, src, m_t_cols[i], m_neg_cols[i], dstt, srct))
return false;
}
return true;
}
void copy_column(
bool copy_column(
tbv& dst, tbv const& src,
unsigned col_dst, unsigned col_src,
udoc_relation const& dstt,
@ -1162,8 +1169,12 @@ namespace datalog {
IF_VERBOSE(3, verbose_stream() << "copy column " << idx_src
<< " to " << idx_dst << " " << num_tbits << "\n";);
for (unsigned i = 0; i < num_tbits; ++i) {
dm.set(dst, idx_dst + i, src[idx_src + i]);
}
tbit bit = (tbit)(dst[idx_dst + i] & src[idx_src + i]);
if (bit == BIT_z)
return false;
dm.set(dst, idx_dst + i, bit);
}
return true;
}
};