database/mariadb-columnstore-engine
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MCOL-4617 Move in-to-exists predicate creation and injection into the engine.

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We earlier leveraged the server functionality provided by

Item_in_subselect::create_in_to_exists_cond and
Item_in_subselect::inject_in_to_exists_cond

to create and inject the in-to-exists predicate into an IN
subquery's JOIN struct. With this patch, we leave the IN subquery's
JOIN unaltered and instead directly perform this predicate creation
and injection into ColumnStore's select execution plan.
This commit is contained in:
Gagan Goel
2021-03-26 15:41:01 +00:00
parent 374103220c
commit f167a6e505
6 changed files with 1373 additions and 186 deletions
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16
dbcon/mysql/ha_mcs_pushdown.cpp
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@ -834,13 +834,6 @@ create_columnstore_select_handler(THD* thd, SELECT_LEX* select_lex)
if (isPS)
{
sel->prep_where= conds ? conds->copy_andor_structure(thd) : 0;
if (in_subselect_rewrite(sel))
{
unsupported_feature = true;
handler->err_msg.assign("create_columnstore_select_handler(): \
Internal error occured in in_subselect_rewrite()");
}
}
select_lex->update_used_tables();
@ -860,15 +853,6 @@ create_columnstore_select_handler(THD* thd, SELECT_LEX* select_lex)
#endif
join->conds = conds;
}
// MCOL-3747 IN-TO-EXISTS rewrite inside MDB didn't add
// an equi-JOIN condition.
if (!unsupported_feature && !isPS && in_subselect_rewrite(select_lex))
{
unsupported_feature = true;
handler->err_msg.assign("create_columnstore_select_handler(): \
Internal error occured in in_subselect_rewrite()");
}
}
// We shouldn't raise error now so set an error to raise it later in init_SH.