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Faster partition pruning

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Add a new module backend/partitioning/partprune.c, implementing a more
sophisticated algorithm for partition pruning.  The new module uses each
partition's "boundinfo" for pruning instead of constraint exclusion,
based on an idea proposed by Robert Haas of a "pruning program": a list
of steps generated from the query quals which are run iteratively to
obtain a list of partitions that must be scanned in order to satisfy
those quals.

At present, this targets planner-time partition pruning, but there exist
further patches to apply partition pruning at execution time as well.

This commit also moves some definitions from include/catalog/partition.h
to a new file include/partitioning/partbounds.h, in an attempt to
rationalize partitioning related code.

Authors: Amit Langote, David Rowley, Dilip Kumar
Reviewers: Robert Haas, Kyotaro Horiguchi, Ashutosh Bapat, Jesper Pedersen.
Discussion: https://postgr.es/m/098b9c71-1915-1a2a-8d52-1a7a50ce79e8@lab.ntt.co.jp
This commit is contained in:
Alvaro Herrera
2018-04-06 16:23:04 -03:00
parent 11523e860f
commit 9fdb675fc5
27 changed files with 3993 additions and 415 deletions
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13
src/backend/nodes/equalfuncs.c
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@@ -915,16 +915,6 @@ _equalAppendRelInfo(const AppendRelInfo *a, const AppendRelInfo *b)
return true;
}
static bool
_equalPartitionedChildRelInfo(const PartitionedChildRelInfo *a, const PartitionedChildRelInfo *b)
{
COMPARE_SCALAR_FIELD(parent_relid);
COMPARE_NODE_FIELD(child_rels);
COMPARE_SCALAR_FIELD(part_cols_updated);
return true;
}
static bool
_equalPlaceHolderInfo(const PlaceHolderInfo *a, const PlaceHolderInfo *b)
{
@@ -3230,9 +3220,6 @@ equal(const void *a, const void *b)
case T_AppendRelInfo:
retval = _equalAppendRelInfo(a, b);
break;
case T_PartitionedChildRelInfo:
retval = _equalPartitionedChildRelInfo(a, b);
break;
case T_PlaceHolderInfo:
retval = _equalPlaceHolderInfo(a, b);
break;