Thanks for the suggestion, EXPLAIN PLAN seems to be the same as EXPLAIN, it
does show me that both queries use the objectID_timestamp index.
I have now also tried to use EXPLAIN ANALYZE (did not know about that
before) on both queries with 1.3.176 and that shows that the "in"-query has
a much higher scancount (number of entries + 1):
SELECT
TEST.ID,
TEST.OBJECT_ID,
TEST.TIMESTAMP
FROM PUBLIC.TEST
/* PUBLIC.IDX_OBJECTID_TIMESTAMP: TIMESTAMP >= 1496268000000
AND OBJECT_ID = 2844
AND TIMESTAMP <= 1493589600000
*/
/* scanCount: 1 */
WHERE (TIMESTAMP >= 1496268000000)
AND ((OBJECT_ID = 2844)
AND (TIMESTAMP <= 1493589600000))
-----------------------------------------------
SELECT
TEST.ID,
TEST.OBJECT_ID,
TEST.TIMESTAMP
FROM PUBLIC.TEST
/* PUBLIC.IDX_OBJECTID_TIMESTAMP: TIMESTAMP >= 1496268000000
AND OBJECT_ID IN(2844, 2845)
AND TIMESTAMP <= 1493589600000
*/
/* scanCount: 1973016 */
WHERE (TIMESTAMP >= 1496268000000)
AND ((OBJECT_ID IN(2844, 2845))
AND (TIMESTAMP <= 1493589600000))
/*
TRIP.IDX_OBJECTID_TIMESTAMP read: 23250
*/
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