database/mariadb-columnstore-engine
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MCOL-894 Upmerged the fist part of the patch into develop.

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MCOL-894 Add default values in Compare and CSEP ctors to activate UTF-8 sorting
    properly.

MCOL-894 Unit tests to build a framework for a new parallel sorting.

MCOL-894 Finished with parallel workers invocation.
     The implementation lacks final aggregation step.

MCOL-894 TupleAnnexStep's init and destructor are now parallel execution aware.

    Implemented final merging step for parallel execution finalizeParallelOrderBy().

    Templated unit test to use it with arbitrary number of rows, threads.

Reuse LimitedOrderBy in the final step

MCOL-894 Cleaned up finalizeParallelOrderBy.

MCOL-894 Add and propagate thread variable that controls a number of threads.

    Optimized comparators used for sorting and add corresponding UTs.

    Refactored TupleAnnexStep::finalizeParallelOrderByDistinct.

    Parallel sorting methods now preallocates memory in batches.

MCOL-894 Fixed comparator for StringCompare.
This commit is contained in:
Roman Nozdrin
2019-05-27 16:27:47 +03:00
parent 0d2b0e0070
commit 7b5e5f0eb6
22 changed files with 2132 additions and 332 deletions
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4
dbcon/mysql/ha_mcs_execplan.cpp
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@ -7807,6 +7807,7 @@ int getSelectPlan(gp_walk_info& gwi, SELECT_LEX& select_lex,
// To activate LimitedOrderBy
if(isPushdownHand)
{
csep->orderByThreads(get_orderby_threads(gwi.thd));
csep->specHandlerProcessed(true);
}
}
@ -7844,6 +7845,8 @@ int getSelectPlan(gp_walk_info& gwi, SELECT_LEX& select_lex,
{
Item_int* select = (Item_int*)select_lex.master_unit()->global_parameters()->select_limit;
csep->limitNum(select->val_int());
// MCOL-894 Activate parallel ORDER BY
csep->orderByThreads(get_orderby_threads(gwi.thd));
}
}
}
@ -9840,6 +9843,7 @@ int getGroupPlan(gp_walk_info& gwi, SELECT_LEX& select_lex, SCSEP& csep, cal_gro
{
csep->hasOrderBy(true);
csep->specHandlerProcessed(true);
csep->orderByThreads(get_orderby_threads(gwi.thd));
}
}