database/postgres
1
0
Fork 0
mirror of https://github.com/postgres/postgres.git synced 2025-07-17 06:41:09 +03:00
Code Activity

Some preliminary refactoring towards partitionwise join.

Browse Source 
Partitionwise join proposes add a concept of child join relations,
which will have the same relationship with join relations as "other
member" relations do with base relations.  These relations will need
some but not all of the handling that we currently have for join
relations, and some but not all of the handling that we currently have
for appendrels, since they are a mix of the two.  Refactor a little
bit so that the necessary bits of logic are exposed as separate
functions.

Ashutosh Bapat, reviewed and tested by Rajkumar Raghuwanshi and
by me.

Discussion: http://postgr.es/m/CAFjFpRfqotRR6cM3sooBHMHEVdkFfAZ6PyYg4GRZsoMuW08HjQ@mail.gmail.com
This commit is contained in:
Robert Haas
2017-03-14 18:20:17 -04:00
parent 60f826c5e6
commit c44c47a773
3 changed files with 149 additions and 73 deletions
Download Patch File Download Diff File Expand all files Collapse all files

142
src/backend/optimizer/util/relnode.c
View File

@ -49,6 +49,9 @@ static List *subbuild_joinrel_restrictlist(RelOptInfo *joinrel,
static List *subbuild_joinrel_joinlist(RelOptInfo *joinrel,
List *joininfo_list,
List *new_joininfo);
static void set_foreign_rel_properties(RelOptInfo *joinrel,
RelOptInfo *outer_rel, RelOptInfo *inner_rel);
static void add_join_rel(PlannerInfo *root, RelOptInfo *joinrel);
/*
@ -327,6 +330,82 @@ find_join_rel(PlannerInfo *root, Relids relids)
return NULL;
}
/*
* set_foreign_rel_properties
* Set up foreign-join fields if outer and inner relation are foreign
* tables (or joins) belonging to the same server and assigned to the same
* user to check access permissions as.
*
* In addition to an exact match of userid, we allow the case where one side
* has zero userid (implying current user) and the other side has explicit
* userid that happens to equal the current user; but in that case, pushdown of
* the join is only valid for the current user. The useridiscurrent field
* records whether we had to make such an assumption for this join or any
* sub-join.
*
* Otherwise these fields are left invalid, so GetForeignJoinPaths will not be
* called for the join relation.
*
*/
static void
set_foreign_rel_properties(RelOptInfo *joinrel, RelOptInfo *outer_rel,
RelOptInfo *inner_rel)
{
if (OidIsValid(outer_rel->serverid) &&
inner_rel->serverid == outer_rel->serverid)
{
if (inner_rel->userid == outer_rel->userid)
{
joinrel->serverid = outer_rel->serverid;
joinrel->userid = outer_rel->userid;
joinrel->useridiscurrent = outer_rel->useridiscurrent || inner_rel->useridiscurrent;
joinrel->fdwroutine = outer_rel->fdwroutine;
}
else if (!OidIsValid(inner_rel->userid) &&
outer_rel->userid == GetUserId())
{
joinrel->serverid = outer_rel->serverid;
joinrel->userid = outer_rel->userid;
joinrel->useridiscurrent = true;
joinrel->fdwroutine = outer_rel->fdwroutine;
}
else if (!OidIsValid(outer_rel->userid) &&
inner_rel->userid == GetUserId())
{
joinrel->serverid = outer_rel->serverid;
joinrel->userid = inner_rel->userid;
joinrel->useridiscurrent = true;
joinrel->fdwroutine = outer_rel->fdwroutine;
}
}
}
/*
* add_join_rel
* Add given join relation to the list of join relations in the given
* PlannerInfo. Also add it to the auxiliary hashtable if there is one.
*/
static void
add_join_rel(PlannerInfo *root, RelOptInfo *joinrel)
{
/* GEQO requires us to append the new joinrel to the end of the list! */
root->join_rel_list = lappend(root->join_rel_list, joinrel);
/* store it into the auxiliary hashtable if there is one. */
if (root->join_rel_hash)
{
JoinHashEntry *hentry;
bool found;
hentry = (JoinHashEntry *) hash_search(root->join_rel_hash,
&(joinrel->relids),
HASH_ENTER,
&found);
Assert(!found);
hentry->join_rel = joinrel;
}
}
/*
* build_join_rel
* Returns relation entry corresponding to the union of two given rels,
@ -425,46 +504,8 @@ build_join_rel(PlannerInfo *root,
joinrel->joininfo = NIL;
joinrel->has_eclass_joins = false;
/*
* Set up foreign-join fields if outer and inner relation are foreign
* tables (or joins) belonging to the same server and assigned to the same
* user to check access permissions as. In addition to an exact match of
* userid, we allow the case where one side has zero userid (implying
* current user) and the other side has explicit userid that happens to
* equal the current user; but in that case, pushdown of the join is only
* valid for the current user. The useridiscurrent field records whether
* we had to make such an assumption for this join or any sub-join.
*
* Otherwise these fields are left invalid, so GetForeignJoinPaths will
* not be called for the join relation.
*/
if (OidIsValid(outer_rel->serverid) &&
inner_rel->serverid == outer_rel->serverid)
{
if (inner_rel->userid == outer_rel->userid)
{
joinrel->serverid = outer_rel->serverid;
joinrel->userid = outer_rel->userid;
joinrel->useridiscurrent = outer_rel->useridiscurrent || inner_rel->useridiscurrent;
joinrel->fdwroutine = outer_rel->fdwroutine;
}
else if (!OidIsValid(inner_rel->userid) &&
outer_rel->userid == GetUserId())
{
joinrel->serverid = outer_rel->serverid;
joinrel->userid = outer_rel->userid;
joinrel->useridiscurrent = true;
joinrel->fdwroutine = outer_rel->fdwroutine;
}
else if (!OidIsValid(outer_rel->userid) &&
inner_rel->userid == GetUserId())
{
joinrel->serverid = outer_rel->serverid;
joinrel->userid = inner_rel->userid;
joinrel->useridiscurrent = true;
joinrel->fdwroutine = outer_rel->fdwroutine;
}
}
/* Compute information relevant to the foreign relations. */
set_foreign_rel_properties(joinrel, outer_rel, inner_rel);
/*
* Create a new tlist containing just the vars that need to be output from
@ -532,25 +573,8 @@ build_join_rel(PlannerInfo *root,
is_parallel_safe(root, (Node *) joinrel->reltarget->exprs))
joinrel->consider_parallel = true;
/*
* Add the joinrel to the query's joinrel list, and store it into the
* auxiliary hashtable if there is one. NB: GEQO requires us to append
* the new joinrel to the end of the list!
*/
root->join_rel_list = lappend(root->join_rel_list, joinrel);
if (root->join_rel_hash)
{
JoinHashEntry *hentry;
bool found;
hentry = (JoinHashEntry *) hash_search(root->join_rel_hash,
&(joinrel->relids),
HASH_ENTER,
&found);
Assert(!found);
hentry->join_rel = joinrel;
}
/* Add the joinrel to the PlannerInfo. */
add_join_rel(root, joinrel);
/*
* Also, if dynamic-programming join search is active, add the new joinrel