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Commitb0b72c6

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committed
Don't pass down nonnullable_vars while reducing outer joins.
We weren't actually using the passed-down list for anything, otherthan computing the new value to be passed down further. I (tgl)probably had the idea that we'd need this data eventually; butno use-case has emerged in a good long while, so let's just stopexpending useless cycles here.Richard GuoDiscussion:https://postgr.es/m/CAMbWs48KLy9aBb=sZ5MoNmnqAcGHaW_JTGWLCgoE_uMW7S6C-A@mail.gmail.com
1 parentff8fa0b commitb0b72c6

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1 file changed

+6
-27
lines changed

1 file changed

+6
-27
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‎src/backend/optimizer/prep/prepjointree.c‎

Lines changed: 6 additions & 27 deletions
Original file line numberDiff line numberDiff line change
@@ -117,7 +117,6 @@ static void reduce_outer_joins_pass2(Node *jtnode,
117117
reduce_outer_joins_state*state,
118118
PlannerInfo*root,
119119
Relidsnonnullable_rels,
120-
List*nonnullable_vars,
121120
List*forced_null_vars);
122121
staticNode*remove_useless_results_recurse(PlannerInfo*root,Node*jtnode);
123122
staticintget_result_relid(PlannerInfo*root,Node*jtnode);
@@ -2693,7 +2692,7 @@ reduce_outer_joins(PlannerInfo *root)
26932692
elog(ERROR,"so where are the outer joins?");
26942693

26952694
reduce_outer_joins_pass2((Node*)root->parse->jointree,
2696-
state,root,NULL,NIL,NIL);
2695+
state,root,NULL,NIL);
26972696
}
26982697

26992698
/*
@@ -2770,15 +2769,13 @@ reduce_outer_joins_pass1(Node *jtnode)
27702769
*state: state data collected by phase 1 for this node
27712770
*root: toplevel planner state
27722771
*nonnullable_rels: set of base relids forced non-null by upper quals
2773-
*nonnullable_vars: list of Vars forced non-null by upper quals
27742772
*forced_null_vars: list of Vars forced null by upper quals
27752773
*/
27762774
staticvoid
27772775
reduce_outer_joins_pass2(Node*jtnode,
27782776
reduce_outer_joins_state*state,
27792777
PlannerInfo*root,
27802778
Relidsnonnullable_rels,
2781-
List*nonnullable_vars,
27822779
List*forced_null_vars)
27832780
{
27842781
/*
@@ -2795,16 +2792,12 @@ reduce_outer_joins_pass2(Node *jtnode,
27952792
ListCell*l;
27962793
ListCell*s;
27972794
Relidspass_nonnullable_rels;
2798-
List*pass_nonnullable_vars;
27992795
List*pass_forced_null_vars;
28002796

28012797
/* Scan quals to see if we can add any constraints */
28022798
pass_nonnullable_rels=find_nonnullable_rels(f->quals);
28032799
pass_nonnullable_rels=bms_add_members(pass_nonnullable_rels,
28042800
nonnullable_rels);
2805-
pass_nonnullable_vars=find_nonnullable_vars(f->quals);
2806-
pass_nonnullable_vars=list_concat(pass_nonnullable_vars,
2807-
nonnullable_vars);
28082801
pass_forced_null_vars=find_forced_null_vars(f->quals);
28092802
pass_forced_null_vars=list_concat(pass_forced_null_vars,
28102803
forced_null_vars);
@@ -2817,7 +2810,6 @@ reduce_outer_joins_pass2(Node *jtnode,
28172810
if (sub_state->contains_outer)
28182811
reduce_outer_joins_pass2(lfirst(l),sub_state,root,
28192812
pass_nonnullable_rels,
2820-
pass_nonnullable_vars,
28212813
pass_forced_null_vars);
28222814
}
28232815
bms_free(pass_nonnullable_rels);
@@ -2830,8 +2822,6 @@ reduce_outer_joins_pass2(Node *jtnode,
28302822
JoinTypejointype=j->jointype;
28312823
reduce_outer_joins_state*left_state=linitial(state->sub_states);
28322824
reduce_outer_joins_state*right_state=lsecond(state->sub_states);
2833-
List*local_nonnullable_vars=NIL;
2834-
boolcomputed_local_nonnullable_vars= false;
28352825

28362826
/* Can we simplify this join? */
28372827
switch (jointype)
@@ -2906,17 +2896,18 @@ reduce_outer_joins_pass2(Node *jtnode,
29062896
*/
29072897
if (jointype==JOIN_LEFT)
29082898
{
2899+
List*nonnullable_vars;
29092900
List*overlap;
29102901

2911-
local_nonnullable_vars=find_nonnullable_vars(j->quals);
2912-
computed_local_nonnullable_vars=true;
2902+
/* Find Vars inj->quals that must be non-null in joined rows */
2903+
nonnullable_vars=find_nonnullable_vars(j->quals);
29132904

29142905
/*
2915-
* It's not sufficient to check whetherlocal_nonnullable_vars and
2906+
* It's not sufficient to check whethernonnullable_vars and
29162907
* forced_null_vars overlap: we need to know if the overlap
29172908
* includes any RHS variables.
29182909
*/
2919-
overlap=list_intersection(local_nonnullable_vars,
2910+
overlap=list_intersection(nonnullable_vars,
29202911
forced_null_vars);
29212912
if (overlap!=NIL&&
29222913
bms_overlap(pull_varnos(root, (Node*)overlap),
@@ -2941,7 +2932,6 @@ reduce_outer_joins_pass2(Node *jtnode,
29412932
Relidslocal_nonnullable_rels;
29422933
List*local_forced_null_vars;
29432934
Relidspass_nonnullable_rels;
2944-
List*pass_nonnullable_vars;
29452935
List*pass_forced_null_vars;
29462936

29472937
/*
@@ -2968,16 +2958,12 @@ reduce_outer_joins_pass2(Node *jtnode,
29682958
if (jointype!=JOIN_FULL)
29692959
{
29702960
local_nonnullable_rels=find_nonnullable_rels(j->quals);
2971-
if (!computed_local_nonnullable_vars)
2972-
local_nonnullable_vars=find_nonnullable_vars(j->quals);
29732961
local_forced_null_vars=find_forced_null_vars(j->quals);
29742962
if (jointype==JOIN_INNER||jointype==JOIN_SEMI)
29752963
{
29762964
/* OK to merge upper and local constraints */
29772965
local_nonnullable_rels=bms_add_members(local_nonnullable_rels,
29782966
nonnullable_rels);
2979-
local_nonnullable_vars=list_concat(local_nonnullable_vars,
2980-
nonnullable_vars);
29812967
local_forced_null_vars=list_concat(local_forced_null_vars,
29822968
forced_null_vars);
29832969
}
@@ -2995,26 +2981,22 @@ reduce_outer_joins_pass2(Node *jtnode,
29952981
{
29962982
/* pass union of local and upper constraints */
29972983
pass_nonnullable_rels=local_nonnullable_rels;
2998-
pass_nonnullable_vars=local_nonnullable_vars;
29992984
pass_forced_null_vars=local_forced_null_vars;
30002985
}
30012986
elseif (jointype!=JOIN_FULL)/* ie, LEFT or ANTI */
30022987
{
30032988
/* can't pass local constraints to non-nullable side */
30042989
pass_nonnullable_rels=nonnullable_rels;
3005-
pass_nonnullable_vars=nonnullable_vars;
30062990
pass_forced_null_vars=forced_null_vars;
30072991
}
30082992
else
30092993
{
30102994
/* no constraints pass through JOIN_FULL */
30112995
pass_nonnullable_rels=NULL;
3012-
pass_nonnullable_vars=NIL;
30132996
pass_forced_null_vars=NIL;
30142997
}
30152998
reduce_outer_joins_pass2(j->larg,left_state,root,
30162999
pass_nonnullable_rels,
3017-
pass_nonnullable_vars,
30183000
pass_forced_null_vars);
30193001
}
30203002

@@ -3024,19 +3006,16 @@ reduce_outer_joins_pass2(Node *jtnode,
30243006
{
30253007
/* pass appropriate constraints, per comment above */
30263008
pass_nonnullable_rels=local_nonnullable_rels;
3027-
pass_nonnullable_vars=local_nonnullable_vars;
30283009
pass_forced_null_vars=local_forced_null_vars;
30293010
}
30303011
else
30313012
{
30323013
/* no constraints pass through JOIN_FULL */
30333014
pass_nonnullable_rels=NULL;
3034-
pass_nonnullable_vars=NIL;
30353015
pass_forced_null_vars=NIL;
30363016
}
30373017
reduce_outer_joins_pass2(j->rarg,right_state,root,
30383018
pass_nonnullable_rels,
3039-
pass_nonnullable_vars,
30403019
pass_forced_null_vars);
30413020
}
30423021
bms_free(local_nonnullable_rels);

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