diff -U3 /Users/john/pgtest/master/build/../../../pgdev/postgres/src/test/regress/expected/alter_table.out /Users/john/pgtest/master/build/src/test/regress/results/alter_table.out
--- /Users/john/pgtest/master/build/../../../pgdev/postgres/src/test/regress/expected/alter_table.out	2019-03-14 09:07:56.000000000 +0800
+++ /Users/john/pgtest/master/build/src/test/regress/results/alter_table.out	2019-04-25 15:03:05.000000000 +0800
@@ -1431,20 +1431,19 @@
 ERROR:  column "........pg.dropped.1........" does not exist
 -- test create as and select into
 insert into atacc1 values (21, 22, 23);
+ERROR:  could not read block 0 in file "base/16384/31379": read only 0 of 8192 bytes
 create table attest1 as select * from atacc1;
 select * from attest1;
- b  | c  | d  
-----+----+----
- 21 | 22 | 23
-(1 row)
+ b | c | d 
+---+---+---
+(0 rows)
 
 drop table attest1;
 select * into attest2 from atacc1;
 select * from attest2;
- b  | c  | d  
-----+----+----
- 21 | 22 | 23
-(1 row)
+ b | c | d 
+---+---+---
+(0 rows)
 
 drop table attest2;
 -- try dropping all columns
@@ -1453,7 +1452,7 @@
 alter table atacc1 drop b;
 select * from atacc1;
 --
-(1 row)
+(0 rows)
 
 drop table atacc1;
 -- test constraint error reporting in presence of dropped columns