From 91e9e89dccdfdf4216953d3d8f5515dcdef177fb Mon Sep 17 00:00:00 2001 From: David Rowley Date: Thu, 22 Jul 2021 14:03:19 +1200 Subject: Make nodeSort.c use Datum sorts for single column sorts Datum sorts can be significantly faster than tuple sorts, especially when the data type being sorted is a pass-by-value type. Something in the region of 50-70% performance improvements appear to be possible. Just in case there's any confusion; the Datum sort is only used when the targetlist of the Sort node contains a single column, not when there's a single column in the sort key and multiple items in the target list. Author: Ronan Dunklau Reviewed-by: James Coleman, David Rowley, Ranier Vilela, Hou Zhijie Tested-by: John Naylor Discussion: https://postgr.es/m/3177670.itZtoPt7T5@aivenronan --- src/include/nodes/execnodes.h | 1 + 1 file changed, 1 insertion(+) (limited to 'src/include/nodes/execnodes.h') diff --git a/src/include/nodes/execnodes.h b/src/include/nodes/execnodes.h index ffc7844756..37cb4f3d59 100644 --- a/src/include/nodes/execnodes.h +++ b/src/include/nodes/execnodes.h @@ -2151,6 +2151,7 @@ typedef struct SortState int64 bound_Done; /* value of bound we did the sort with */ void *tuplesortstate; /* private state of tuplesort.c */ bool am_worker; /* are we a worker? */ + bool datumSort; /* Datum sort instead of tuple sort? */ SharedSortInfo *shared_info; /* one entry per worker */ } SortState; -- cgit v1.2.1