This query will show the interface  mapping  in the following order

PROJECT_NAME  , FOLDER_NAME  ,  INTERFACE_NAME  , INTERFACE_TYPE , TARGET_SCHEMA , TARGET_TABLE , TARGET_COLUMN , TARGET_DATATYPE , SOURCE_SCHEMA , SOURCE_TABLE , SOURCE_COLUMN , SOURCE_DATATYPE , MAPPING  filtered by Interface , Folder  or  Project Name. I have commented out other option of Interface & Folder..

SELECT DISTINCT
SNP_PROJECT.PROJECT_NAME    AS PROJECT_NAME,
SNP_FOLDER.FOLDER_NAME      AS FOLDER_NAME,
SNP_POP.POP_NAME            AS INTERFACE_NAME,
CASE
WHEN SNP_POP.WSTAGE='E' THEN 'TABLE_TO_TABLE_INF'
ELSE 'TEMP_INTERFACE' END   AS INTERFACE_TYPE,
SNP_POP.LSCHEMA_NAME        AS TARGET_SCHEMA,
SNP_POP.TABLE_NAME          AS TARGET_TABLE,
SNP_POP_COL.COL_NAME        AS TARGET_COLUMN,
CASE
WHEN SNP_POP.WSTAGE='E' THEN T_COL.SOURCE_DT||' ('||T_COL.LONGC||')'
ELSE SNP_POP_COL.SOURCE_DT||' ('||SNP_POP_COL.LONGC||')'
END AS TRG_DATATYPE,
SNP_SOURCE_TAB.LSCHEMA_NAME AS SOURCE_SCHEMA,
SNP_TABLE.TABLE_NAME        AS SOURCE_TABLE,
SNP_COL.COL_NAME            AS SOURCE_COLUMN ,
SNP_COL.SOURCE_DT||' ('||SNP_COL.LONGC||')' AS SRC_DATATYPE,
rowtocol('SELECT DISTINCT TXT FROM SNP_TXT WHERE I_TXT='||i_txt ) AS COLUMN_MAPPING
-- to use without rowtocol use SNP_TXT.TXT AS COLUMN_MAPPING
FROM SNP_PROJECT
LEFT OUTER JOIN SNP_FOLDER ON SNP_FOLDER.I_PROJECT=SNP_PROJECT.I_PROJECT
LEFT OUTER JOIN SNP_POP ON SNP_POP.I_FOLDER=SNP_FOLDER.I_FOLDER
LEFT OUTER JOIN SNP_POP_COL ON SNP_POP_COL.I_POP=SNP_POP.I_POP
LEFT OUTER JOIN SNP_POP_CLAUSE ON SNP_POP_CLAUSE.I_POP=SNP_POP.I_POP
LEFT OUTER JOIN SNP_TXT S_TXT ON S_TXT.I_TXT=SNP_POP_CLAUSE.I_TXT_SQL
LEFT OUTER JOIN SNP_TXT ON SNP_TXT.I_TXT= SNP_POP_COL.I_TXT_MAP
LEFT OUTER JOIN SNP_SOURCE_TAB ON SNP_SOURCE_TAB.I_POP=SNP_POP.I_POP
LEFT OUTER JOIN SNP_TXT_CROSSR ON SNP_TXT_CROSSR.I_TXT=SNP_TXT.I_TXT
LEFT OUTER JOIN SNP_COL ON SNP_COL.I_COL=SNP_TXT_CROSSR.I_COL
LEFT OUTER JOIN SNP_TABLE ON SNP_TABLE.I_TABLE= SNP_COL.I_TABLE
LEFT OUTER JOIN SNP_COL T_COL ON T_COL.I_COL=SNP_POP_COL.I_COL
WHERE
-- SNP_POP.POP_NAME='&TAB'
-- SNP_FOLDER.FOLDER_NAME ='&TAB'
SNP_PROJECT.PROJECT_NAME='DEVELOPMENT'
ORDER BY SNP_POP.POP_NAME

I have used the rowtocol function  for SNP_TXT.TXT  ,as when  mapping length  is more than  256 character ODI stores in separate line with different i_txt number causing  mapping to come into two or multiple rows . In order to avoid such scenario and in order to get all the Mapping field information into a single column , i have used this function rowtocol.

Source code for  rowtocol function is available here – > http://www.oracle.com/technology/oramag/code/tips2004/050304.html