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Fixed the bug mdev-12838.

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If the optimizer chose an execution plan where
a semi-join nest were materialized and the
result of materialization was scanned to access
other tables by ref access it could build a key
over columns of the tables from the nest that
were actually inaccessible.
The patch performs a proper check whether a key
that uses columns of the tables from a materialized
semi-join nest can be employed to access outer tables.
This commit is contained in:
Igor Babaev 2017-06-07 12:45:09 -07:00
commit c258ca2463
6 changed files with 461 additions and 5 deletions
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8
sql/sql_select.h
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@ -540,6 +540,8 @@ typedef struct st_join_table {
!(used_sjm_lookup_tables & ~emb_sj_nest->sj_inner_tables));
}
bool keyuse_is_valid_for_access_in_chosen_plan(JOIN *join, KEYUSE *keyuse);
} JOIN_TAB;
@ -1003,6 +1005,11 @@ public:
to materialize and access by lookups
*/
table_map sjm_lookup_tables;
/**
Bitmap of semijoin tables that the chosen plan decided
to materialize to scan the results of materialization
*/
table_map sjm_scan_tables;
/*
Constant tables for which we have found a row (as opposed to those for
which we didn't).
@ -1331,6 +1338,7 @@ public:
pre_sort_join_tab= NULL;
emb_sjm_nest= NULL;
sjm_lookup_tables= 0;
sjm_scan_tables= 0;
/*
The following is needed because JOIN::cleanup(true) may be called for
joins for which JOIN::optimize was aborted with an error before a proper