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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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6
dbcon/mysql/ha_mcs_impl.h
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@ -29,7 +29,7 @@ extern int ha_mcs_impl_create(const char* name, TABLE* table_arg, HA_CREATE_INFO
extern int ha_mcs_impl_delete_table(const char* name);
extern int ha_mcs_impl_open(const char* name, int mode, uint32_t test_if_locked);
extern int ha_mcs_impl_close(void);
extern int ha_mcs_impl_rnd_init(TABLE* table);
extern int ha_mcs_impl_rnd_init(TABLE* table, const std::vector<COND*>& condStack);
extern int ha_mcs_impl_rnd_next(uchar* buf, TABLE* table);
extern int ha_mcs_impl_rnd_end(TABLE* table, bool is_derived_hand = false);
extern int ha_mcs_impl_write_row(const uchar* buf, TABLE* table, uint64_t rows_changed);
@ -39,10 +39,10 @@ extern int ha_mcs_impl_rename_table(const char* from, const char* to);
extern int ha_mcs_impl_commit (handlerton* hton, THD* thd, bool all);
extern int ha_mcs_impl_rollback (handlerton* hton, THD* thd, bool all);
extern int ha_mcs_impl_close_connection (handlerton* hton, THD* thd);
extern COND* ha_mcs_impl_cond_push(COND* cond, TABLE* table);
extern COND* ha_mcs_impl_cond_push(COND* cond, TABLE* table, std::vector<COND*>&);
extern int ha_mcs_impl_external_lock(THD* thd, TABLE* table, int lock_type);
extern int ha_mcs_impl_update_row();
extern int ha_mcs_impl_direct_update_delete_rows(bool execute, ha_rows *affected_rows);
extern int ha_mcs_impl_direct_update_delete_rows(bool execute, ha_rows *affected_rows, const std::vector<COND*>& condStack);
extern int ha_mcs_impl_delete_row();
extern int ha_mcs_impl_rnd_pos(uchar* buf, uchar* pos);
extern int ha_cs_impl_pushdown_init(mcs_handler_info* handler_info, TABLE* table);