diff --git a/src/backend/commands/copy.c b/src/backend/commands/copy.c
index 86b0fb3..ac21ff2 100644
--- a/src/backend/commands/copy.c
+++ b/src/backend/commands/copy.c
@@ -2784,17 +2784,6 @@ CopyFrom(CopyState cstate)
 						nPartitionChanges = 0;
 					}
 
-					/*
-					 * Tests have shown that using multi-inserts when the
-					 * partition changes on every tuple slightly decreases the
-					 * performance, however, there are benefits even when only
-					 * some batches have just 2 tuples, so let's enable
-					 * multi-inserts even when the average is quite low.
-					 */
-					leafpart_use_multi_insert = avgTuplesPerPartChange >= 1.3 &&
-						!has_before_insert_row_trig &&
-						!has_instead_insert_row_trig &&
-						resultRelInfo->ri_FdwRoutine == NULL;
 				}
 				else
 					leafpart_use_multi_insert = false;
@@ -2820,6 +2809,18 @@ CopyFrom(CopyState cstate)
 
 				has_instead_insert_row_trig = (resultRelInfo->ri_TrigDesc &&
 											   resultRelInfo->ri_TrigDesc->trig_insert_instead_row);
+				/*
+				 * Tests have shown that using multi-inserts when the
+				 * partition changes on every tuple slightly decreases the
+				 * performance, however, there are benefits even when only
+				 * some batches have just 2 tuples, so let's enable
+				 * multi-inserts even when the average is quite low.
+				 */
+				if (insertMethod == CIM_MULTI_CONDITIONAL)
+					leafpart_use_multi_insert = avgTuplesPerPartChange >= 1.3 &&
+						!has_before_insert_row_trig &&
+						!has_instead_insert_row_trig &&
+						resultRelInfo->ri_FdwRoutine == NULL;
 
 				/*
 				 * We'd better make the bulk insert mechanism gets a new
diff --git a/src/test/regress/input/copy.source b/src/test/regress/input/copy.source
index 014b1b5..4cb03c5 100644
--- a/src/test/regress/input/copy.source
+++ b/src/test/regress/input/copy.source
@@ -162,4 +162,23 @@ copy parted_copytest from '@abs_builddir@/results/parted_copytest.csv';
 select tableoid::regclass,count(*),sum(a) from parted_copytest
 group by tableoid order by tableoid::regclass::name;
 
+truncate parted_copytest;
+
+-- create before insert row trigger on parted_copytest_a2
+create function part_ins_func() returns trigger language plpgsql as $$
+begin
+  return new;
+end;
+$$;
+
+create trigger part_ins_trig
+	before insert on parted_copytest_a2
+	for each row
+	execute procedure part_ins_func();
+
+copy parted_copytest from '@abs_builddir@/results/parted_copytest.csv';
+
+select tableoid::regclass,count(*),sum(a) from parted_copytest
+group by tableoid order by tableoid::regclass::name;
+
 drop table parted_copytest;
diff --git a/src/test/regress/output/copy.source b/src/test/regress/output/copy.source
index ab09615..ddd652c 100644
--- a/src/test/regress/output/copy.source
+++ b/src/test/regress/output/copy.source
@@ -121,4 +121,24 @@ group by tableoid order by tableoid::regclass::name;
  parted_copytest_a2 |    10 |  10055
 (2 rows)
 
+truncate parted_copytest;
+-- create before insert row trigger on parted_copytest_a2
+create function part_ins_func() returns trigger language plpgsql as $$
+begin
+  return new;
+end;
+$$;
+create trigger part_ins_trig
+	before insert on parted_copytest_a2
+	for each row
+	execute procedure part_ins_func();
+copy parted_copytest from '@abs_builddir@/results/parted_copytest.csv';
+select tableoid::regclass,count(*),sum(a) from parted_copytest
+group by tableoid order by tableoid::regclass::name;
+      tableoid      | count |  sum   
+--------------------+-------+--------
+ parted_copytest_a1 |  1010 | 510655
+ parted_copytest_a2 |    10 |  10055
+(2 rows)
+
 drop table parted_copytest;