diff --git a/src/common/backend/utils/adt/varchar.cpp b/src/common/backend/utils/adt/varchar.cpp
index 9b68d9355cd16b9e535dc70c84a9569f467c7c59..55a72d62c7d28895b5c53482f86fc96b8d067611 100644
--- a/src/common/backend/utils/adt/varchar.cpp
+++ b/src/common/backend/utils/adt/varchar.cpp
@@ -317,7 +317,7 @@ Datum bpchar(PG_FUNCTION_ARGS)
          *
          * Now, only explicit cast char type data should pad blank space.
          */
-        if (!isExplicit)
+        if (!isExplicit || DB_IS_CMPT(PG_FORMAT | B_FORMAT))
             maxlen = len;
     }
 
diff --git a/src/test/regress/expected/b_compatibility.out b/src/test/regress/expected/b_compatibility.out
index df93b5cff7a2aa87b1d09081009fd787d5d4826f..9bd82f4881f6f68280e2bc9b29c8fcdbbd03241a 100644
--- a/src/test/regress/expected/b_compatibility.out
+++ b/src/test/regress/expected/b_compatibility.out
@@ -785,6 +785,12 @@ select bit_length(a),bit_length(b) from char_test;
           8 |          8
 (8 rows)
 
+select 'ni啊shaeskeeee'::char(3);
+ bpchar 
+--------
+ ni啊
+(1 row)
+
 create index a on char_test(a);
 create index b on char_test(b);
 set enable_seqscan to off;
diff --git a/src/test/regress/expected/pg_compatibility.out b/src/test/regress/expected/pg_compatibility.out
index 5c1cc24d9812235b41fee5b48997454b3f74172a..03d0f26370b68f03d5df99ff264d8a60174d8685 100644
--- a/src/test/regress/expected/pg_compatibility.out
+++ b/src/test/regress/expected/pg_compatibility.out
@@ -82,6 +82,12 @@ select bit_length(a),bit_length(b) from char_test;
           8 |          8
 (6 rows)
 
+select 'ni啊shaeskeeee'::char(3);
+ bpchar 
+--------
+ ni啊
+(1 row)
+
 create index a on char_test(a);
 create index b on char_test(b);
 set enable_seqscan to off;
diff --git a/src/test/regress/sql/b_compatibility.sql b/src/test/regress/sql/b_compatibility.sql
index c2e94ac866549fd1ba3425ddd35aff229e5e4936..8249d6db0dd73835d1161097c71b7429bb6666b9 100644
--- a/src/test/regress/sql/b_compatibility.sql
+++ b/src/test/regress/sql/b_compatibility.sql
@@ -204,6 +204,7 @@ insert into char_test values('0','0');
 select length(a),length(b) from char_test;
 select lengthb(a),lengthb(b) from char_test;
 select bit_length(a),bit_length(b) from char_test;
+select 'ni啊shaeskeeee'::char(3);
 
 create index a on char_test(a);
 create index b on char_test(b);
diff --git a/src/test/regress/sql/pg_compatibility.sql b/src/test/regress/sql/pg_compatibility.sql
index 4d720643a083b1e5e7d7c69a1da1216309bd4128..6bd029d6909f4e7be47ffcd495d862fbb7ea3657 100644
--- a/src/test/regress/sql/pg_compatibility.sql
+++ b/src/test/regress/sql/pg_compatibility.sql
@@ -32,6 +32,7 @@ insert into char_test values('0','0');
 select length(a),length(b) from char_test;
 select lengthb(a),lengthb(b) from char_test;
 select bit_length(a),bit_length(b) from char_test;
+select 'ni啊shaeskeeee'::char(3);
 
 create index a on char_test(a);
 create index b on char_test(b);