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commit 525b87facb2f9a806386f9a5de53a63102e1735b
Author: Chris Hajas <[email protected]>
AuthorDate: Fri Mar 17 09:25:59 2023 -0700

    Disable GUC optimizer_penalize_broadcast_threshold when set to 0 (#15209)
    
    Currently, when optimizer_penalize_broadcast_threshold is set to 0, it
    will disable broadcasts when the estimated tuples to be broadcast is
    greater than 0. Because the value of this GUC is limited to INT_MAX,
    there is no way to disable this guc. This commit disables penalizing
    broadcast when this value is 0.
---
 .../dxl/minidump/DisableBroadcastThreshold.mdp     | 1172 ++++++++++++++++++++
 .../gporca/libgpdbcost/src/CCostModelGPDB.cpp      |    3 +-
 src/backend/gporca/server/CMakeLists.txt           |    2 +-
 src/backend/utils/misc/guc_gp.c                    |    4 +-
 4 files changed, 1177 insertions(+), 4 deletions(-)

diff --git a/src/backend/gporca/data/dxl/minidump/DisableBroadcastThreshold.mdp 
b/src/backend/gporca/data/dxl/minidump/DisableBroadcastThreshold.mdp
new file mode 100644
index 0000000000..40e83ad6db
--- /dev/null
+++ b/src/backend/gporca/data/dxl/minidump/DisableBroadcastThreshold.mdp
@@ -0,0 +1,1172 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<dxl:DXLMessage xmlns:dxl="http://greenplum.com/dxl/2010/12/";>
+  <dxl:Comment><![CDATA[
+  Objective: Setting optimizer_penalize_broadcast_threshold to 0 should 
disable this traceflag
+  and not penalize broadcasts. We should see a broadcast instead of gathers in 
this case.
+
+  set optimizer_penalize_broadcast_threshold = 0;
+  set optimizer_enable_motion_redistribute = off;
+  create table foo (a int);
+  create table bar (a int) distributed randomly;
+  insert into foo select i from generate_series(1,100000)i;
+  insert into bar select i from generate_series(1,1000)i;
+  analyze foo;
+  analyze bar;
+
+  explain select * from foo, bar where foo.a=bar.a;
+                                              QUERY PLAN
+  
------------------------------------------------------------------------------------------------------
+   Gather Motion 3:1  (slice1; segments: 3)  (cost=0.00..869.06 rows=1000 
width=8)
+     ->  Hash Join  (cost=0.00..869.03 rows=334 width=8)
+           Hash Cond: (foo.a = bar.a)
+           ->  Seq Scan on foo  (cost=0.00..431.62 rows=33334 width=4)
+           ->  Hash  (cost=431.08..431.08 rows=1000 width=4)
+                 ->  Broadcast Motion 3:3  (slice2; segments: 3)  
(cost=0.00..431.08 rows=1000 width=4)
+                       ->  Seq Scan on bar  (cost=0.00..431.01 rows=334 
width=4)
+   Optimizer: Pivotal Optimizer (GPORCA)
+  (8 rows)
+  ]]></dxl:Comment>
+  <dxl:Thread Id="0">
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+      <dxl:EnumeratorConfig Id="0" PlanSamples="0" CostThreshold="0"/>
+      <dxl:StatisticsConfig DampingFactorFilter="0.750000" 
DampingFactorJoin="0.000000" DampingFactorGroupBy="0.750000" 
MaxStatsBuckets="100"/>
+      <dxl:CTEConfig CTEInliningCutoff="0"/>
+      <dxl:WindowOids RowNumber="3100" Rank="3101"/>
+      <dxl:CostModelConfig CostModelType="1" SegmentsForCosting="3">
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LowerBound="1023.500000" UpperBound="1024.500000"/>
+        </dxl:CostParams>
+      </dxl:CostModelConfig>
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BroadcastThreshold="0" EnforceConstraintsOnDML="false" 
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+        <dxl:StatsBucket Frequency="0.010000" DistinctValues="10.000000">
+          <dxl:LowerBound Closed="true" TypeMdid="0.23.1.0" Value="860"/>
+          <dxl:UpperBound Closed="false" TypeMdid="0.23.1.0" Value="870"/>
+        </dxl:StatsBucket>
+        <dxl:StatsBucket Frequency="0.010000" DistinctValues="10.000000">
+          <dxl:LowerBound Closed="true" TypeMdid="0.23.1.0" Value="870"/>
+          <dxl:UpperBound Closed="false" TypeMdid="0.23.1.0" Value="880"/>
+        </dxl:StatsBucket>
+        <dxl:StatsBucket Frequency="0.010000" DistinctValues="10.000000">
+          <dxl:LowerBound Closed="true" TypeMdid="0.23.1.0" Value="880"/>
+          <dxl:UpperBound Closed="false" TypeMdid="0.23.1.0" Value="890"/>
+        </dxl:StatsBucket>
+        <dxl:StatsBucket Frequency="0.010000" DistinctValues="10.000000">
+          <dxl:LowerBound Closed="true" TypeMdid="0.23.1.0" Value="890"/>
+          <dxl:UpperBound Closed="false" TypeMdid="0.23.1.0" Value="900"/>
+        </dxl:StatsBucket>
+        <dxl:StatsBucket Frequency="0.010000" DistinctValues="10.000000">
+          <dxl:LowerBound Closed="true" TypeMdid="0.23.1.0" Value="900"/>
+          <dxl:UpperBound Closed="false" TypeMdid="0.23.1.0" Value="910"/>
+        </dxl:StatsBucket>
+        <dxl:StatsBucket Frequency="0.010000" DistinctValues="10.000000">
+          <dxl:LowerBound Closed="true" TypeMdid="0.23.1.0" Value="910"/>
+          <dxl:UpperBound Closed="false" TypeMdid="0.23.1.0" Value="920"/>
+        </dxl:StatsBucket>
+        <dxl:StatsBucket Frequency="0.010000" DistinctValues="10.000000">
+          <dxl:LowerBound Closed="true" TypeMdid="0.23.1.0" Value="920"/>
+          <dxl:UpperBound Closed="false" TypeMdid="0.23.1.0" Value="930"/>
+        </dxl:StatsBucket>
+        <dxl:StatsBucket Frequency="0.010000" DistinctValues="10.000000">
+          <dxl:LowerBound Closed="true" TypeMdid="0.23.1.0" Value="930"/>
+          <dxl:UpperBound Closed="false" TypeMdid="0.23.1.0" Value="940"/>
+        </dxl:StatsBucket>
+        <dxl:StatsBucket Frequency="0.010000" DistinctValues="10.000000">
+          <dxl:LowerBound Closed="true" TypeMdid="0.23.1.0" Value="940"/>
+          <dxl:UpperBound Closed="false" TypeMdid="0.23.1.0" Value="950"/>
+        </dxl:StatsBucket>
+        <dxl:StatsBucket Frequency="0.010000" DistinctValues="10.000000">
+          <dxl:LowerBound Closed="true" TypeMdid="0.23.1.0" Value="950"/>
+          <dxl:UpperBound Closed="false" TypeMdid="0.23.1.0" Value="960"/>
+        </dxl:StatsBucket>
+        <dxl:StatsBucket Frequency="0.010000" DistinctValues="10.000000">
+          <dxl:LowerBound Closed="true" TypeMdid="0.23.1.0" Value="960"/>
+          <dxl:UpperBound Closed="false" TypeMdid="0.23.1.0" Value="970"/>
+        </dxl:StatsBucket>
+        <dxl:StatsBucket Frequency="0.010000" DistinctValues="10.000000">
+          <dxl:LowerBound Closed="true" TypeMdid="0.23.1.0" Value="970"/>
+          <dxl:UpperBound Closed="false" TypeMdid="0.23.1.0" Value="980"/>
+        </dxl:StatsBucket>
+        <dxl:StatsBucket Frequency="0.010000" DistinctValues="10.000000">
+          <dxl:LowerBound Closed="true" TypeMdid="0.23.1.0" Value="980"/>
+          <dxl:UpperBound Closed="false" TypeMdid="0.23.1.0" Value="990"/>
+        </dxl:StatsBucket>
+        <dxl:StatsBucket Frequency="0.010000" DistinctValues="10.000000">
+          <dxl:LowerBound Closed="true" TypeMdid="0.23.1.0" Value="990"/>
+          <dxl:UpperBound Closed="true" TypeMdid="0.23.1.0" Value="1000"/>
+        </dxl:StatsBucket>
+      </dxl:ColumnStatistics>
+    </dxl:Metadata>
+    <dxl:Query>
+      <dxl:OutputColumns>
+        <dxl:Ident ColId="1" ColName="a" TypeMdid="0.23.1.0"/>
+        <dxl:Ident ColId="9" ColName="a" TypeMdid="0.23.1.0"/>
+      </dxl:OutputColumns>
+      <dxl:CTEList/>
+      <dxl:LogicalJoin JoinType="Inner">
+        <dxl:LogicalGet>
+          <dxl:TableDescriptor Mdid="6.16395.1.0" TableName="foo" LockMode="1">
+            <dxl:Columns>
+              <dxl:Column ColId="1" Attno="1" ColName="a" TypeMdid="0.23.1.0" 
ColWidth="4"/>
+              <dxl:Column ColId="2" Attno="-1" ColName="ctid" 
TypeMdid="0.27.1.0" ColWidth="6"/>
+              <dxl:Column ColId="3" Attno="-2" ColName="xmin" 
TypeMdid="0.28.1.0" ColWidth="4"/>
+              <dxl:Column ColId="4" Attno="-3" ColName="cmin" 
TypeMdid="0.29.1.0" ColWidth="4"/>
+              <dxl:Column ColId="5" Attno="-4" ColName="xmax" 
TypeMdid="0.28.1.0" ColWidth="4"/>
+              <dxl:Column ColId="6" Attno="-5" ColName="cmax" 
TypeMdid="0.29.1.0" ColWidth="4"/>
+              <dxl:Column ColId="7" Attno="-6" ColName="tableoid" 
TypeMdid="0.26.1.0" ColWidth="4"/>
+              <dxl:Column ColId="8" Attno="-7" ColName="gp_segment_id" 
TypeMdid="0.23.1.0" ColWidth="4"/>
+            </dxl:Columns>
+          </dxl:TableDescriptor>
+        </dxl:LogicalGet>
+        <dxl:LogicalGet>
+          <dxl:TableDescriptor Mdid="6.16398.1.0" TableName="bar" LockMode="1">
+            <dxl:Columns>
+              <dxl:Column ColId="9" Attno="1" ColName="a" TypeMdid="0.23.1.0" 
ColWidth="4"/>
+              <dxl:Column ColId="10" Attno="-1" ColName="ctid" 
TypeMdid="0.27.1.0" ColWidth="6"/>
+              <dxl:Column ColId="11" Attno="-2" ColName="xmin" 
TypeMdid="0.28.1.0" ColWidth="4"/>
+              <dxl:Column ColId="12" Attno="-3" ColName="cmin" 
TypeMdid="0.29.1.0" ColWidth="4"/>
+              <dxl:Column ColId="13" Attno="-4" ColName="xmax" 
TypeMdid="0.28.1.0" ColWidth="4"/>
+              <dxl:Column ColId="14" Attno="-5" ColName="cmax" 
TypeMdid="0.29.1.0" ColWidth="4"/>
+              <dxl:Column ColId="15" Attno="-6" ColName="tableoid" 
TypeMdid="0.26.1.0" ColWidth="4"/>
+              <dxl:Column ColId="16" Attno="-7" ColName="gp_segment_id" 
TypeMdid="0.23.1.0" ColWidth="4"/>
+            </dxl:Columns>
+          </dxl:TableDescriptor>
+        </dxl:LogicalGet>
+        <dxl:Comparison ComparisonOperator="=" OperatorMdid="0.96.1.0">
+          <dxl:Ident ColId="1" ColName="a" TypeMdid="0.23.1.0"/>
+          <dxl:Ident ColId="9" ColName="a" TypeMdid="0.23.1.0"/>
+        </dxl:Comparison>
+      </dxl:LogicalJoin>
+    </dxl:Query>
+    <dxl:Plan Id="0" SpaceSize="7">
+      <dxl:GatherMotion InputSegments="0,1,2" OutputSegments="-1">
+        <dxl:Properties>
+          <dxl:Cost StartupCost="0" TotalCost="869.056127" Rows="1000.000000" 
Width="8"/>
+        </dxl:Properties>
+        <dxl:ProjList>
+          <dxl:ProjElem ColId="0" Alias="a">
+            <dxl:Ident ColId="0" ColName="a" TypeMdid="0.23.1.0"/>
+          </dxl:ProjElem>
+          <dxl:ProjElem ColId="8" Alias="a">
+            <dxl:Ident ColId="8" ColName="a" TypeMdid="0.23.1.0"/>
+          </dxl:ProjElem>
+        </dxl:ProjList>
+        <dxl:Filter/>
+        <dxl:SortingColumnList/>
+        <dxl:HashJoin JoinType="Inner">
+          <dxl:Properties>
+            <dxl:Cost StartupCost="0" TotalCost="869.026313" 
Rows="1000.000000" Width="8"/>
+          </dxl:Properties>
+          <dxl:ProjList>
+            <dxl:ProjElem ColId="0" Alias="a">
+              <dxl:Ident ColId="0" ColName="a" TypeMdid="0.23.1.0"/>
+            </dxl:ProjElem>
+            <dxl:ProjElem ColId="8" Alias="a">
+              <dxl:Ident ColId="8" ColName="a" TypeMdid="0.23.1.0"/>
+            </dxl:ProjElem>
+          </dxl:ProjList>
+          <dxl:Filter/>
+          <dxl:JoinFilter/>
+          <dxl:HashCondList>
+            <dxl:Comparison ComparisonOperator="=" OperatorMdid="0.96.1.0">
+              <dxl:Ident ColId="0" ColName="a" TypeMdid="0.23.1.0"/>
+              <dxl:Ident ColId="8" ColName="a" TypeMdid="0.23.1.0"/>
+            </dxl:Comparison>
+          </dxl:HashCondList>
+          <dxl:TableScan>
+            <dxl:Properties>
+              <dxl:Cost StartupCost="0" TotalCost="431.623333" 
Rows="100000.000000" Width="4"/>
+            </dxl:Properties>
+            <dxl:ProjList>
+              <dxl:ProjElem ColId="0" Alias="a">
+                <dxl:Ident ColId="0" ColName="a" TypeMdid="0.23.1.0"/>
+              </dxl:ProjElem>
+            </dxl:ProjList>
+            <dxl:Filter/>
+            <dxl:TableDescriptor Mdid="6.16395.1.0" TableName="foo" 
LockMode="1">
+              <dxl:Columns>
+                <dxl:Column ColId="0" Attno="1" ColName="a" 
TypeMdid="0.23.1.0" ColWidth="4"/>
+                <dxl:Column ColId="1" Attno="-1" ColName="ctid" 
TypeMdid="0.27.1.0" ColWidth="6"/>
+                <dxl:Column ColId="2" Attno="-2" ColName="xmin" 
TypeMdid="0.28.1.0" ColWidth="4"/>
+                <dxl:Column ColId="3" Attno="-3" ColName="cmin" 
TypeMdid="0.29.1.0" ColWidth="4"/>
+                <dxl:Column ColId="4" Attno="-4" ColName="xmax" 
TypeMdid="0.28.1.0" ColWidth="4"/>
+                <dxl:Column ColId="5" Attno="-5" ColName="cmax" 
TypeMdid="0.29.1.0" ColWidth="4"/>
+                <dxl:Column ColId="6" Attno="-6" ColName="tableoid" 
TypeMdid="0.26.1.0" ColWidth="4"/>
+                <dxl:Column ColId="7" Attno="-7" ColName="gp_segment_id" 
TypeMdid="0.23.1.0" ColWidth="4"/>
+              </dxl:Columns>
+            </dxl:TableDescriptor>
+          </dxl:TableScan>
+          <dxl:BroadcastMotion InputSegments="0,1,2" OutputSegments="0,1,2">
+            <dxl:Properties>
+              <dxl:Cost StartupCost="0" TotalCost="431.080313" 
Rows="3000.000000" Width="4"/>
+            </dxl:Properties>
+            <dxl:ProjList>
+              <dxl:ProjElem ColId="8" Alias="a">
+                <dxl:Ident ColId="8" ColName="a" TypeMdid="0.23.1.0"/>
+              </dxl:ProjElem>
+            </dxl:ProjList>
+            <dxl:Filter/>
+            <dxl:SortingColumnList/>
+            <dxl:TableScan>
+              <dxl:Properties>
+                <dxl:Cost StartupCost="0" TotalCost="431.006233" 
Rows="1000.000000" Width="4"/>
+              </dxl:Properties>
+              <dxl:ProjList>
+                <dxl:ProjElem ColId="8" Alias="a">
+                  <dxl:Ident ColId="8" ColName="a" TypeMdid="0.23.1.0"/>
+                </dxl:ProjElem>
+              </dxl:ProjList>
+              <dxl:Filter/>
+              <dxl:TableDescriptor Mdid="6.16398.1.0" TableName="bar" 
LockMode="1">
+                <dxl:Columns>
+                  <dxl:Column ColId="8" Attno="1" ColName="a" 
TypeMdid="0.23.1.0" ColWidth="4"/>
+                  <dxl:Column ColId="9" Attno="-1" ColName="ctid" 
TypeMdid="0.27.1.0" ColWidth="6"/>
+                  <dxl:Column ColId="10" Attno="-2" ColName="xmin" 
TypeMdid="0.28.1.0" ColWidth="4"/>
+                  <dxl:Column ColId="11" Attno="-3" ColName="cmin" 
TypeMdid="0.29.1.0" ColWidth="4"/>
+                  <dxl:Column ColId="12" Attno="-4" ColName="xmax" 
TypeMdid="0.28.1.0" ColWidth="4"/>
+                  <dxl:Column ColId="13" Attno="-5" ColName="cmax" 
TypeMdid="0.29.1.0" ColWidth="4"/>
+                  <dxl:Column ColId="14" Attno="-6" ColName="tableoid" 
TypeMdid="0.26.1.0" ColWidth="4"/>
+                  <dxl:Column ColId="15" Attno="-7" ColName="gp_segment_id" 
TypeMdid="0.23.1.0" ColWidth="4"/>
+                </dxl:Columns>
+              </dxl:TableDescriptor>
+            </dxl:TableScan>
+          </dxl:BroadcastMotion>
+        </dxl:HashJoin>
+      </dxl:GatherMotion>
+    </dxl:Plan>
+  </dxl:Thread>
+</dxl:DXLMessage>
diff --git a/src/backend/gporca/libgpdbcost/src/CCostModelGPDB.cpp 
b/src/backend/gporca/libgpdbcost/src/CCostModelGPDB.cpp
index d48b96b0ef..0429e0a71a 100644
--- a/src/backend/gporca/libgpdbcost/src/CCostModelGPDB.cpp
+++ b/src/backend/gporca/libgpdbcost/src/CCostModelGPDB.cpp
@@ -1474,7 +1474,8 @@ CCostModelGPDB::CostMotion(CMemoryPool *mp, 
CExpressionHandle &exprhdl,
                ULONG broadcast_threshold =
                        optimizer_config->GetHint()->UlBroadcastThreshold();
 
-               if (num_rows_outer > broadcast_threshold)
+               // if broadcast threshold is 0, don't penalize
+               if (broadcast_threshold > 0 && num_rows_outer > 
broadcast_threshold)
                {
                        DOUBLE ulPenalizationFactor = 100000000000000.0;
                        costLocal = CCost(ulPenalizationFactor);
diff --git a/src/backend/gporca/server/CMakeLists.txt 
b/src/backend/gporca/server/CMakeLists.txt
index 36c44ac6ed..d01b760fca 100644
--- a/src/backend/gporca/server/CMakeLists.txt
+++ b/src/backend/gporca/server/CMakeLists.txt
@@ -169,7 +169,7 @@ CTAS-random-distributed-from-replicated-distributed-table
 ProjectRepeatedColumn1 ProjectRepeatedColumn2 NLJ-BC-Outer-Spool-Inner 
Self-Comparison Self-Comparison-Nullable
 SelectCheckConstraint ExpandJoinOrder SelectOnBpchar EqualityJoin 
EffectsOfJoinFilter InnerJoin-With-OuterRefs
 UDA-AnyElement-1 UDA-AnyElement-2 Project-With-NonScalar-Func SixWayDPv2 
Join-Varchar-Equality NLJ-Rewindability
-NLJ-Rewindability-CTAS;
+NLJ-Rewindability-CTAS DisableBroadcastThreshold;
 
 CJoinPredTest:
 MultipleDampedPredJoinCardinality MultipleIndependentPredJoinCardinality 
MultiDistKeyJoinCardinality
diff --git a/src/backend/utils/misc/guc_gp.c b/src/backend/utils/misc/guc_gp.c
index dd177a768a..d7fb32b950 100644
--- a/src/backend/utils/misc/guc_gp.c
+++ b/src/backend/utils/misc/guc_gp.c
@@ -4250,7 +4250,7 @@ struct config_int ConfigureNamesInt_gp[] =
 
        {
                {"optimizer_xform_bind_threshold", PGC_USERSET, 
DEVELOPER_OPTIONS,
-                       gettext_noop("Maximum number bindings per xform per 
group expression"),
+                       gettext_noop("Maximum number bindings per xform per 
group expression. A value of 0 disables."),
                        NULL,
                        GUC_NO_SHOW_ALL | GUC_NOT_IN_SAMPLE
                },
@@ -4293,7 +4293,7 @@ struct config_int ConfigureNamesInt_gp[] =
 
        {
                {"optimizer_penalize_broadcast_threshold", PGC_USERSET, 
QUERY_TUNING_METHOD,
-                       gettext_noop("Maximum number of rows of a relation that 
can be broadcasted without penalty."),
+                       gettext_noop("Maximum number of rows of a relation that 
can be broadcasted without penalty. A value of 0 disables."),
                        NULL,
                        GUC_NO_SHOW_ALL | GUC_NOT_IN_SAMPLE
                },


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