diff --git a/src/backend/commands/copy.c b/src/backend/commands/copy.c
index f9ec035aa99..6b06ff6c868 100644
--- a/src/backend/commands/copy.c
+++ b/src/backend/commands/copy.c
@@ -28,6 +28,7 @@
 #include "mb/pg_wchar.h"
 #include "miscadmin.h"
 #include "nodes/makefuncs.h"
+#include "nodes/nodeFuncs.h"
 #include "optimizer/optimizer.h"
 #include "parser/parse_coerce.h"
 #include "parser/parse_collate.h"
@@ -187,6 +188,7 @@ DoCopy(ParseState *pstate, const CopyStmt *stmt,
 
 			whereClause = (Node *) canonicalize_qual((Expr *) whereClause, false);
 			whereClause = (Node *) make_ands_implicit((Expr *) whereClause);
+			fix_opfuncids(whereClause);
 		}
 
 		tupDesc = RelationGetDescr(rel);
diff --git a/src/test/regress/expected/copy2.out b/src/test/regress/expected/copy2.out
index 695b1b2d635..859f40b3fc0 100644
--- a/src/test/regress/expected/copy2.out
+++ b/src/test/regress/expected/copy2.out
@@ -155,6 +155,7 @@ LINE 1: COPY x TO stdout WHERE a = 1;
                          ^
 COPY x from stdin WHERE a = 50004;
 COPY x from stdin WHERE a > 60003;
+COPY x from stdin WHERE NOT (a < 70003);
 COPY x from stdin WHERE f > 60003;
 ERROR:  column "f" does not exist
 LINE 1: COPY x from stdin WHERE f > 60003;
@@ -202,12 +203,13 @@ SELECT * FROM x;
  50004 | 25 | 35         | 45     | before trigger fired
  60004 | 25 | 35         | 45     | before trigger fired
  60005 | 26 | 36         | 46     | before trigger fired
+ 70003 | 24 | 34         | 44     | before trigger fired
      1 |  1 | stuff      | test_1 | after trigger fired
      2 |  2 | stuff      | test_2 | after trigger fired
      3 |  3 | stuff      | test_3 | after trigger fired
      4 |  4 | stuff      | test_4 | after trigger fired
      5 |  5 | stuff      | test_5 | after trigger fired
-(28 rows)
+(29 rows)
 
 -- check copy out
 COPY x TO stdout;
@@ -234,6 +236,7 @@ COPY x TO stdout;
 50004	25	35	45	before trigger fired
 60004	25	35	45	before trigger fired
 60005	26	36	46	before trigger fired
+70003	24	34	44	before trigger fired
 1	1	stuff	test_1	after trigger fired
 2	2	stuff	test_2	after trigger fired
 3	3	stuff	test_3	after trigger fired
@@ -263,6 +266,7 @@ Delimiter	before trigger fired
 35	before trigger fired
 35	before trigger fired
 36	before trigger fired
+34	before trigger fired
 stuff	after trigger fired
 stuff	after trigger fired
 stuff	after trigger fired
@@ -292,6 +296,7 @@ I'm null	before trigger fired
 25	before trigger fired
 25	before trigger fired
 26	before trigger fired
+24	before trigger fired
 1	after trigger fired
 2	after trigger fired
 3	after trigger fired
diff --git a/src/test/regress/sql/copy2.sql b/src/test/regress/sql/copy2.sql
index ac00285f4c2..a17f407e02c 100644
--- a/src/test/regress/sql/copy2.sql
+++ b/src/test/regress/sql/copy2.sql
@@ -175,6 +175,12 @@ COPY x from stdin WHERE a > 60003;
 60005	26	36	46	56
 \.
 
+COPY x from stdin WHERE NOT (a < 70003);
+70001	22	32	42	52
+70002	23	33	43	53
+70003	24	34	44	54
+\.
+
 COPY x from stdin WHERE f > 60003;
 \.