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Code Issues

Improvement #8161 : Cardinality estimation should use primary record versions only

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This commit is contained in:
Vlad Khorsun 2024-06-18 20:10:06 +03:00
parent cee5712085
commit a39c3554b2
1 changed files with 38 additions and 34 deletions
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72
src/jrd/dpm.epp
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@ -245,47 +245,51 @@ double DPM_cardinality(thread_db* tdbb, jrd_rel* relation, const Format* format)
ULONG recordCount = 0, recordLength = 0;
const RelationPages* const relPages = relation->getPages(tdbb);
const vcl* const vector = relPages->rel_pages;
if (vector)
RelationPages* const relPages = relation->getPages(tdbb);
if (relPages->rel_pages)
{
WIN window(relPages->rel_pg_space_id, (*vector)[0]);
Ods::pointer_page* ppage =
(Ods::pointer_page*) CCH_FETCH(tdbb, &window, LCK_read, pag_pointer);
if (!ppage)
bool done = false;
for (ULONG sequence = 0; !done; sequence++)
{
BUGCHECK(243);
// msg 243 missing pointer page in DPM_data_pages
}
WIN window(relPages->rel_pg_space_id, -1);
const ULONG* page = ppage->ppg_page;
const ULONG* const end_page = page + ppage->ppg_count;
while (page < end_page)
{
if (*page)
const pointer_page* ppage =
get_pointer_page(tdbb, relation, relPages, &window, sequence, LCK_read);
if (!ppage)
{
Ods::data_page* dpage =
(Ods::data_page*) CCH_HANDOFF(tdbb, &window, *page, LCK_read, pag_data);
const data_page::dpg_repeat* index = dpage->dpg_rpt;
const data_page::dpg_repeat* const end = index + dpage->dpg_count;
for (; index < end; index++)
{
if (index->dpg_offset)
{
recordCount++;
recordLength += index->dpg_length - RHD_SIZE;
}
}
break;
BUGCHECK(243);
// msg 243 missing pointer page in DPM_data_pages
}
page++;
}
const UCHAR* bits = (UCHAR*)(ppage->ppg_page + dbb->dbb_dp_per_pp);
for (USHORT slot = 0; slot < ppage->ppg_count; slot++)
{
if (ppage->ppg_page[slot] &&
!PPG_DP_BIT_TEST(bits, slot, ppg_dp_secondary) &&
!PPG_DP_BIT_TEST(bits, slot, ppg_dp_empty))
{
Ods::data_page* dpage =
(Ods::data_page*) CCH_HANDOFF(tdbb, &window, ppage->ppg_page[slot], LCK_read, pag_data);
CCH_RELEASE(tdbb, &window);
const data_page::dpg_repeat* index = dpage->dpg_rpt;
const data_page::dpg_repeat* const end = index + dpage->dpg_count;
for (; index < end; index++)
{
if (index->dpg_offset)
{
recordCount++;
recordLength += index->dpg_length - RHD_SIZE;
}
}
if (recordCount)
break;
}
}
done = (recordCount != 0) || (ppage->ppg_header.pag_flags & ppg_eof);
CCH_RELEASE(tdbb, &window);
}
}
// AB: If we have only 1 data-page then the cardinality calculation