export/import data pump mixed case username

$ cat expdp.schema.par
directory=dpump
logfile=logdir:expdp.schema.log
dumpfile=expdp.schema.dat
reuse_dumpfiles=true
include=
schemas:"='Brian'"

$ expdp u/u@//stormking:1521/pdbm parfile=expdp.schema.par

Export: Release 12.1.0.2.0 - Production on Sat Jul 30 19:06:47 2016

Copyright (c) 1982, 2014, Oracle and/or its affiliates.  All rights reserved.

Connected to: Oracle Database 12c Enterprise Edition Release 12.1.0.2.0 - 64bit Production
With the Partitioning, Automatic Storage Management, OLAP, Advanced Analytics
and Real Application Testing options
ORA-39001: invalid argument value
ORA-39038: Object path "SCHEMAS" is not supported for SCHEMA jobs.

$ cat expdp.dbms.datapump.sql
set serveroutput on
set linesize 32767
set trimspool on
whenever sqlerror exit 1
column username format a30

define schemaname=&&1
variable schemaname varchar2(30)
exec :schemaname := '&&schemaname'

whenever sqlerror continue
drop user "&&schemaname" cascade;
whenever sqlerror exit 1
create user "&&schemaname" identified by pw;

select username, created from dba_users where username = :schemaname;

declare
        l_dph           number;
        l_jobstate      varchar2(20);
        l_schemaname    varchar2(30) := :schemaname;
        l_filter        varchar2(100);

begin
        l_filter := out_pkg.sprintf( q'{='%s'}', l_schemaname );
        out_pkg.printf( 'filter=%s', l_filter );

        l_dph := dbms_datapump.open (
                operation       => 'EXPORT',
                job_mode        => 'SCHEMA'
        );

        dbms_datapump.add_file (
                handle          => l_dph,
                filename        => 'expdp.schema.dat',
                directory       =>'DPUMP',
                reusefile       => 1
        );

        dbms_datapump.add_file(
                handle          => l_dph,
                filename        => 'expdp.schema.log',
                directory       => 'LOGDIR',
                filetype        => dbms_datapump.ku$_file_type_log_file,
                reusefile       => 1
        );

        dbms_datapump.metadata_filter (
                handle          => l_dph,
                name            => 'SCHEMA_EXPR',
                value           => l_filter
        );

        dbms_datapump.start_job (
                handle          => l_dph
        );

        dbms_datapump.wait_for_job (
                handle          => l_dph,
                job_state       => l_jobstate
        );
        out_pkg.printf( 'job state=%s', l_jobstate );
end;
/

drop user "&&schemaname" cascade;


declare
        l_dph           number;
        l_jobstate      varchar2(20);
        l_schemaname    varchar2(30) := :schemaname;
        l_filter        varchar2(100);

begin
        l_filter := out_pkg.sprintf( q'{='%s'}', l_schemaname );
        out_pkg.printf( 'filter=%s', l_filter );

        l_dph := dbms_datapump.open (
                operation       => 'IMPORT',
                job_mode        => 'SCHEMA'
        );

        dbms_datapump.add_file (
                handle          => l_dph,
                filename        => 'expdp.schema.dat',
                directory       =>'DPUMP'
        );

        dbms_datapump.add_file(
                handle          => l_dph,
                filename        => 'impdp.schema.log',
                directory       => 'LOGDIR',
                filetype        => dbms_datapump.ku$_file_type_log_file,
                reusefile       => 1
        );

        dbms_datapump.metadata_filter (
                handle          => l_dph,
                name            => 'SCHEMA_EXPR',
                value           => l_filter
        );

        dbms_datapump.start_job (
                handle          => l_dph
        );

        dbms_datapump.wait_for_job (
                handle          => l_dph,
                job_state       => l_jobstate
        );
        out_pkg.printf( 'job state=%s', l_jobstate );
end;
/

select username, created from dba_users where username = :schemaname;
quit

$ sqlplus u/u@//stormking:1521/pdbm @ expdp.dbms.datapump.sql Brian

SQL*Plus: Release 12.1.0.2.0 Production on Sat Jul 30 19:03:24 2016

Copyright (c) 1982, 2014, Oracle.  All rights reserved.

Last Successful login time: Sat Jul 30 2016 19:01:43 -04:00

Connected to:
Oracle Database 12c Enterprise Edition Release 12.1.0.2.0 - 64bit Production
With the Partitioning, Automatic Storage Management, OLAP, Advanced Analytics
and Real Application Testing options


PL/SQL procedure successfully completed.

old   1: drop user "&&schemaname" cascade
new   1: drop user "Brian" cascade

User dropped.

old   1: create user "&&schemaname" identified by pw
new   1: create user "Brian" identified by pw

User created.


USERNAME                       CREATED
------------------------------ --------------
Brian                          20160730 19:03

filter=='Brian'
job state=COMPLETED

PL/SQL procedure successfully completed.

old   1: drop user "&&schemaname" cascade
new   1: drop user "Brian" cascade

User dropped.

filter=='Brian'
job state=COMPLETED

PL/SQL procedure successfully completed.


USERNAME                       CREATED
------------------------------ --------------
Brian                          20160730 19:03

Disconnected from Oracle Database 12c Enterprise Edition Release 12.1.0.2.0 - 64bit Production
With the Partitioning, Automatic Storage Management, OLAP, Advanced Analytics
and Real Application Testing options