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MCOL-4023 Pushdown WHERE conditions for UPDATE/DELETE.

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For certain queries, such as:
  update cs1 set i = 41 where i = 42 or (i is null and 42 is null);
the SELECT_LEX.where does not contain the required where conditions.
Server sends the where conditions in the call to cond_push(), so
we are storing them in a handler data member, condStack, and later
push them down to getSelectPlan() for UPDATES/DELETEs.
This commit is contained in:
Gagan Goel
2020-05-29 22:30:34 -04:00
committed by Patrick LeBlanc
parent a8f5d353bd
commit 01ff2652a6
6 changed files with 98 additions and 22 deletions
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dbcon/mysql/ha_mcs_impl_if.h
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@ -342,7 +342,7 @@ int cp_get_table_plan(THD* thd, execplan::SCSEP& csep, cal_impl_if::cal_table_in
int cp_get_group_plan(THD* thd, execplan::SCSEP& csep, cal_impl_if::cal_group_info& gi);
int cs_get_derived_plan(derived_handler* handler, THD* thd, execplan::SCSEP& csep, gp_walk_info& gwi);
int cs_get_select_plan(select_handler* handler, THD* thd, execplan::SCSEP& csep, gp_walk_info& gwi);
int getSelectPlan(gp_walk_info& gwi, SELECT_LEX& select_lex, execplan::SCSEP& csep, bool isUnion = false, bool isSelectHandlerTop = false);
int getSelectPlan(gp_walk_info& gwi, SELECT_LEX& select_lex, execplan::SCSEP& csep, bool isUnion = false, bool isSelectHandlerTop = false, const std::vector<COND*>& condStack = std::vector<COND*>());
int getGroupPlan(gp_walk_info& gwi, SELECT_LEX& select_lex, execplan::SCSEP& csep, cal_group_info& gi, bool isUnion = false);
void setError(THD* thd, uint32_t errcode, const std::string errmsg, gp_walk_info* gwi);
void setError(THD* thd, uint32_t errcode, const std::string errmsg);