database/mariadb-columnstore-engine
1
0
Fork 0
mirror of https://github.com/mariadb-corporation/mariadb-columnstore-engine.git synced 2025-07-30 19:23:07 +03:00
Code Activity

MCOL-1052 LIMIT processing refactoring in getGroupPlan().

Browse Source
This commit is contained in:
Roman Nozdrin
2018-08-30 17:03:14 +03:00
parent 62f296b443
commit 07561c43d7
3 changed files with 26 additions and 10 deletions
Download Patch File Download Diff File Expand all files Collapse all files

12
dbcon/execplan/calpontselectexecutionplan.h
View File

@ -575,6 +575,15 @@ public:
return fHasOrderBy;
}
void specHandlerProcessed(const bool hand)
{
fSpecHandlerProcessed = hand;
}
const bool specHandlerProcessed() const
{
return fSpecHandlerProcessed;
}
void selectSubList(const SelectList& selectSubList)
{
fSelectSubList = selectSubList;
@ -872,6 +881,9 @@ private:
uint32_t fPriority;
uint32_t fStringTableThreshold;
// for specific handlers processing, e.g. GROUP BY
bool fSpecHandlerProcessed;
// Derived table involved in the query. For derived table optimization
std::vector<SCSEP> fSubSelectList;

5
dbcon/joblist/joblistfactory.cpp
View File

@ -1846,12 +1846,13 @@ void makeVtableModeSteps(CalpontSelectExecutionPlan* csep, JobInfo& jobInfo,
if (csep->limitNum() != (uint64_t) - 1)
{
// special case for outer query order by limit -- return all
if (jobInfo.subId == 0 && csep->hasOrderBy())
if (jobInfo.subId == 0 && csep->hasOrderBy() && !csep->specHandlerProcessed())
{
jobInfo.limitCount = (uint64_t) - 1;
}
// support order by and limit in sub-query/union
// support order by and limit in sub-query/union or
// GROUP BY handler processed outer query order
else if (csep->orderByCols().size() > 0)
{
addOrderByAndLimit(csep, jobInfo);

17
dbcon/mysql/ha_calpont_execplan.cpp
View File

@ -10164,24 +10164,27 @@ int getGroupPlan(gp_walk_info& gwi, SELECT_LEX& select_lex, SCSEP& csep, cal_gro
}
}
if (ord_cols.length() > 0) // has order by
if ( gwi.orderByCols.size() ) // has order by
{
gwi.thd->infinidb_vtable.has_order_by = true;
csep->hasOrderBy(true);
ord_cols = " order by " + ord_cols;
select_query += ord_cols;
csep->specHandlerProcessed(true);
}
}
// LIMIT and OFFSET are extracted from TABLE_LIST elements.
// All of JOIN-ed tables contain relevant limit and offset.
if (gi.groupByTables->select_lex->select_limit)
uint64_t limit = (uint64_t)-1;
if (gi.groupByTables->select_lex->select_limit &&
( limit = static_cast<Item_int*>(gi.groupByTables->select_lex->select_limit)->val_int() ) &&
limit != (uint64_t)-1 )
{
csep->limitNum(((Item_int*)gi.groupByTables->select_lex->select_limit)->val_int());
csep->limitNum(limit);
}
else
else if (csep->hasOrderBy())
{
if (csep->hasOrderBy())
// We use LimitedOrderBy so set the limit to
// go through the check in addOrderByAndLimit
csep->limitNum((uint64_t) - 2);
}