database/mariadb-columnstore-engine
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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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7
dbcon/mysql/ha_mcs.h
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@ -18,6 +18,7 @@
MA 02110-1301, USA. */
#ifndef HA_MCS_H__
#define HA_MCS_H__
#include <my_config.h>
#include "idb_mysql.h"
#include "ha_mcs_sysvars.h"
@ -44,6 +45,11 @@ class ha_mcs: public handler
THR_LOCK_DATA lock; ///< MySQL lock
COLUMNSTORE_SHARE* share; ///< Shared lock info
ulonglong int_table_flags;
// We are using a vector here to mimick the stack functionality
// using push_back() and pop_back()
// as apparently there is a linker error on the std::stack<COND*>::pop()
// call on Ubuntu18.
std::vector<COND*> condStack;
public:
ha_mcs(handlerton* hton, TABLE_SHARE* table_arg);
@ -222,6 +228,7 @@ public:
THR_LOCK_DATA** store_lock(THD* thd, THR_LOCK_DATA** to,
enum thr_lock_type lock_type); ///< required
const COND* cond_push(const COND* cond);
void cond_pop() override;
uint8 table_cache_type()
{
return HA_CACHE_TBL_NOCACHE;