set hive.optimize.ppd=true;

EXPLAIN EXTENDED
SELECT
  CAST(key AS INT) AS user_id, value
  FROM srcpart
  WHERE ds='2008-04-08' and
  ( CASE WHEN (value LIKE 'aaa%' OR value LIKE 'vvv%')
   THEN 1
   ELSE 0  end ) > 0
;

SELECT
  CAST(key AS INT) AS user_id, value
  FROM srcpart
  WHERE ds='2008-04-08' and
  ( CASE WHEN (value LIKE 'aaa%' OR value LIKE 'vvv%')
   THEN 1
   ELSE 0  end ) > 0
;

set hive.optimize.ppd=false;

EXPLAIN EXTENDED
SELECT
  CAST(key AS INT) AS user_id, value
  FROM srcpart
  WHERE ds='2008-04-08' and
  ( CASE WHEN (value LIKE 'aaa%' OR value LIKE 'vvv%')
   THEN 1
   ELSE 0  end ) > 0
;

SELECT
  CAST(key AS INT) AS user_id, value
  FROM srcpart
  WHERE ds='2008-04-08' and
  ( CASE WHEN (value LIKE 'aaa%' OR value LIKE 'vvv%')
   THEN 1
   ELSE 0  end ) > 0
;