SHOW CREATE TABLE nil pointer dereference for temporary table

[tiancaiamao]

Development Task

mysql> create global temporary table t3 (i int primary key, j int) on commit delete rows;
Query OK, 0 rows affected (0.01 sec)

mysql> show create table t3;
ERROR 1105 (HY000): runtime error: invalid memory address or nil pointer dereference

On the master branch

[err="runtime error: invalid memory address or nil pointer dereference                                                                                                                                             
github.com/pingcap/tidb/executor.(*recordSet).Next.func1                                                                                                                                                           
        /home/genius/project/src/github.com/pingcap/tidb/executor/adapter.go:138                                                                                                                                   
runtime.gopanic                                                                                                                                                                                                    
        /snap/go/7360/src/runtime/panic.go:965                                                                                                                                                                     
runtime.panicmem                                                                                                                                                                                                   
        /snap/go/7360/src/runtime/panic.go:212                                                                                                                                                                     
runtime.sigpanic                                                                                                                                                                                                   
        /snap/go/7360/src/runtime/signal_unix.go:734                                                                                                                                                               
github.com/pingcap/tidb/meta/autoid.Allocators.Get                                                                                                                                                                 
        /home/genius/project/src/github.com/pingcap/tidb/meta/autoid/autoid.go:161                                                                                                                                 
github.com/pingcap/tidb/executor.ConstructResultOfShowCreateTable                                                                                                                                                  
        /home/genius/project/src/github.com/pingcap/tidb/executor/show.go:972                                                                                                                                      
github.com/pingcap/tidb/executor.(*ShowExec).fetchShowCreateTable                                                                                                                                                  
        /home/genius/project/src/github.com/pingcap/tidb/executor/show.go:1094                                                                                                                                     
github.com/pingcap/tidb/executor.(*ShowExec).fetchAll                                                                                                                                                              
        /home/genius/project/src/github.com/pingcap/tidb/executor/show.go:138                                                                                                                                      
github.com/pingcap/tidb/executor.(*ShowExec).Next                                                                                                                                                                  
        /home/genius/project/src/github.com/pingcap/tidb/executor/show.go:101                                                                                                                                      
github.com/pingcap/tidb/executor.Next                                                                                                                                                                              
        /home/genius/project/src/github.com/pingcap/tidb/executor/executor.go:283                                                                                                                                  
github.com/pingcap/tidb/executor.(*recordSet).Next                                                                                                                                                                 
        /home/genius/project/src/github.com/pingcap/tidb/executor/adapter.go:142                                                                                                                                   
github.com/pingcap/tidb/server.(*tidbResultSet).Next                                                                                                                                                               
        /home/genius/project/src/github.com/pingcap/tidb/server/driver_tidb.go:304                                                                                                                                 
github.com/pingcap/tidb/server.(*clientConn).writeChunks                                                                                                                                                           
        /home/genius/project/src/github.com/pingcap/tidb/server/conn.go:1881                                                                                                                                       
github.com/pingcap/tidb/server.(*clientConn).writeResultset                                                                                                                                                        
        /home/genius/project/src/github.com/pingcap/tidb/server/conn.go:1829                                                                                                                                       
github.com/pingcap/tidb/server.(*clientConn).handleStmt                                                                                                                                                            
        /home/genius/project/src/github.com/pingcap/tidb/server/conn.go:1723                                                                                                                                       
github.com/pingcap/tidb/server.(*clientConn).handleQuery                                                                                                                                                           
        /home/genius/project/src/github.com/pingcap/tidb/server/conn.go:1569                                                                                                                                       
github.com/pingcap/tidb/server.(*clientConn).dispatch                                                                                                                                                              
        /home/genius/project/src/github.com/pingcap/tidb/server/conn.go:1103                                                                                                                                       
github.com/pingcap/tidb/server.(*clientConn).Run                                                                                                                                                                   
        /home/genius/project/src/github.com/pingcap/tidb/server/conn.go:861                                                                                                                                        
github.com/pingcap/tidb/server.(*Server).onConn                                                                                                                                                                    
        /home/genius/project/src/github.com/pingcap/tidb/server/server.go:482                                                                                                                                      
runtime.goexit                                                                                                                                                                                                     
        /snap/go/7360/src/runtime/asm_amd64.s:1371" 

[ti-srebot]

Please edit this comment or add a new comment to complete the following information

Not a bug

1. Remove the 'type/bug' label
2. Add notes to indicate why it is not a bug

This issue is introduced just because the temporary table feature is not fully implemented.
I'd rather say it's a development task other than a bug, it only exists on the master branch, and is now fixed.