Creates a readable external table, ext_expenses, using the pxf protocol. The column delimiter is a pipe ( | ).

=# CREATE EXTERNAL TABLE ext_expenses ( name text, 
   date date,  amount float4, category text, desc1 text ) 
   LOCATION ('pxf://dir/data/filename.txt?PROFILE=hdfs:text') 
   FORMAT 'TEXT' (DELIMITER '|');

Refer to Accessing External Data with PXF for information about using the Greenplum Platform Extension Framework (PXF) to access data on a Hadoop Distributed File System.