Hi Tom:
Thanks for your reply! I add logs like this:
if (bms_is_subset(sjinfo->min_lefthand, rel1->relids) &&
bms_is_subset(sjinfo->min_righthand, rel2->relids))
{
if (match_sjinfo) {
elog(LOG, "gunkris111111111111");
return false; /* invalid join path */
}
match_sjinfo = sjinfo;
reversed = false;
}
else if (bms_is_subset(sjinfo->min_lefthand, rel2->relids) &&
bms_is_subset(sjinfo->min_righthand, rel1->relids))
{
if (match_sjinfo) {
elog(LOG, "gunkris222222222222");
return false; /* invalid join path */
}
match_sjinfo = sjinfo;
reversed = true;
}
else if (sjinfo->jointype == JOIN_SEMI &&
bms_equal(sjinfo->syn_righthand, rel2->relids) &&
create_unique_path(root, rel2,
rel2->cheapest_total_path,
sjinfo) != NULL)
{
if (match_sjinfo) {
elog(LOG, "gunkris33333333333333");
return false; /* invalid join path */
}
match_sjinfo = sjinfo;
reversed = false;
unique_ified = true;
}
else if (sjinfo->jointype == JOIN_SEMI &&
bms_equal(sjinfo->syn_righthand, rel1->relids) &&
create_unique_path(root, rel1,
rel1->cheapest_total_path,
sjinfo) != NULL)
{
/* Reversed semijoin case */
if (match_sjinfo) {
elog(LOG, "gunkris4444444444444444");
return false; /* invalid join path */
}
match_sjinfo = sjinfo;
reversed = true;
unique_ified = true;
}
Then I run the core regression tests with "make installcheck-parallel
" for v18beta1 as the document dictates. When the regression test is done, only
the last 2 log entries are found in logfile, the first 2 entries are not
printed at all. I run core regression also with v14.15 and v17.2, the results
are the same. What test suite do I need to run to cover the first 2 branches,
or could you please show me a example query that can cover them? Thank you very
much.
________________________________
发件人: Tom Lane <t...@sss.pgh.pa.us>
发送时间: 2025年5月10日 18:47
收件人: g l <orangegr...@live.com>
抄送: pgsql-gene...@postgresql.org <pgsql-gene...@postgresql.org>
主题: Re: are the 2 if-statements in join_is_legal() removable?
g l <orangegr...@live.com> writes:
> In join_is_legal(), there are 2 decision-making statements based on
> match_sjinfo. I wonder wether their conditions can ever test possitive.
The code coverage report says yes.
https://coverage.postgresql.org/src/backend/optimizer/path/joinrels.c.gcov.html#350
regards, tom lane
