Evade extra table_tuple_fetch_row_version() in ExecUpdate()/ExecDelete()
When we lock tuple using table_tuple_lock() then we at the same time fetch the locked tuple to the slot. In this case we can skip extra table_tuple_fetch_row_version() thank to we've already fetched the 'old' tuple and nobody can change it concurrently since it's locked. Discussion: https://postgr.es/m/CAPpHfdua-YFw3XTprfutzGp28xXLigFtzNbuFY8yPhqeq6X5kg%40mail.gmail.com Reviewed-by: Aleksander Alekseev, Pavel Borisov, Vignesh C, Mason Sharp Reviewed-by: Andres Freund, Chris Travers
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@ -1559,6 +1559,22 @@ ldelete:
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{
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{
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case TM_Ok:
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case TM_Ok:
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Assert(context->tmfd.traversed);
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Assert(context->tmfd.traversed);
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/*
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* Save locked tuple for further processing of
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* RETURNING clause.
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*/
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if (processReturning &&
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resultRelInfo->ri_projectReturning &&
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!resultRelInfo->ri_FdwRoutine)
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{
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TupleTableSlot *returningSlot;
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returningSlot = ExecGetReturningSlot(estate, resultRelInfo);
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ExecCopySlot(returningSlot, inputslot);
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ExecMaterializeSlot(returningSlot);
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}
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epqslot = EvalPlanQual(context->epqstate,
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epqslot = EvalPlanQual(context->epqstate,
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resultRelationDesc,
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resultRelationDesc,
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resultRelInfo->ri_RangeTableIndex,
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resultRelInfo->ri_RangeTableIndex,
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@ -1673,12 +1689,17 @@ ldelete:
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}
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}
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else
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else
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{
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{
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/*
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* Tuple can be already fetched to the returning slot in case
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* we've previously locked it. Fetch the tuple only if the slot
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* is empty.
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*/
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slot = ExecGetReturningSlot(estate, resultRelInfo);
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slot = ExecGetReturningSlot(estate, resultRelInfo);
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if (oldtuple != NULL)
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if (oldtuple != NULL)
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{
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{
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ExecForceStoreHeapTuple(oldtuple, slot, false);
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ExecForceStoreHeapTuple(oldtuple, slot, false);
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}
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}
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else
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else if (TupIsNull(slot))
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{
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{
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if (!table_tuple_fetch_row_version(resultRelationDesc, tupleid,
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if (!table_tuple_fetch_row_version(resultRelationDesc, tupleid,
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SnapshotAny, slot))
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SnapshotAny, slot))
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@ -2393,6 +2414,19 @@ redo_act:
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case TM_Ok:
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case TM_Ok:
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Assert(context->tmfd.traversed);
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Assert(context->tmfd.traversed);
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/* Make sure ri_oldTupleSlot is initialized. */
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if (unlikely(!resultRelInfo->ri_projectNewInfoValid))
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ExecInitUpdateProjection(context->mtstate,
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resultRelInfo);
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/*
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* Save the locked tuple for further calculation
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* of the new tuple.
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*/
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oldSlot = resultRelInfo->ri_oldTupleSlot;
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ExecCopySlot(oldSlot, inputslot);
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ExecMaterializeSlot(oldSlot);
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epqslot = EvalPlanQual(context->epqstate,
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epqslot = EvalPlanQual(context->epqstate,
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resultRelationDesc,
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resultRelationDesc,
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resultRelInfo->ri_RangeTableIndex,
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resultRelInfo->ri_RangeTableIndex,
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@ -2401,18 +2435,6 @@ redo_act:
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/* Tuple not passing quals anymore, exiting... */
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/* Tuple not passing quals anymore, exiting... */
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return NULL;
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return NULL;
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/* Make sure ri_oldTupleSlot is initialized. */
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if (unlikely(!resultRelInfo->ri_projectNewInfoValid))
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ExecInitUpdateProjection(context->mtstate,
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resultRelInfo);
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/* Fetch the most recent version of old tuple. */
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oldSlot = resultRelInfo->ri_oldTupleSlot;
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if (!table_tuple_fetch_row_version(resultRelationDesc,
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tupleid,
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SnapshotAny,
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oldSlot))
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elog(ERROR, "failed to fetch tuple being updated");
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slot = ExecGetUpdateNewTuple(resultRelInfo,
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slot = ExecGetUpdateNewTuple(resultRelInfo,
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epqslot, oldSlot);
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epqslot, oldSlot);
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goto redo_act;
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goto redo_act;
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