This is the output of EXPLAIN ANALYZE for me:
EXPLAIN ANALYZE
SELECT MAX(b.id) as id
FROM tbl_b b
JOIN tbl_a a ON b.tbl_a_id = a.id
GROUP BY b.tbl_a_id
HAVING a.active = true;
PLAN
SELECT
MAX(B.ID) AS ID
FROM PUBLIC.TBL_A A
/* PUBLIC.TBL_A.tableScan */
/* scanCount: 101 */
INNER JOIN PUBLIC.TBL_B B
/* PUBLIC.TBL_B_UK_INDEX_4: TBL_A_ID = A.ID */
ON 1=1
/* scanCount: 50099 */
WHERE B.TBL_A_ID = A.ID
GROUP BY B.TBL_A_ID
HAVING A.ACTIVE = TRUE
/*
total: 892
TBL_B.TBL_B_DATA read: 614 (68%)
TBL_B.TBL_B_UK_INDEX_4 read: 278 (31%)
*/
(1 row, 229 ms)
EXPLAIN ANALYZE
SELECT MAX(b.id) as id
FROM tbl_b b
JOIN tbl_a a ON b.tbl_a_id = a.id
GROUP BY b.tbl_a_id
HAVING a.active = true;
PLAN
SELECT
MAX(B.ID) AS ID
FROM PUBLIC.TBL_A A
/* PUBLIC.TBL_A.tableScan */
/* scanCount: 101 */
INNER JOIN PUBLIC.TBL_B B
/* PUBLIC.TBL_B_IDX: TBL_A_ID = A.ID */
ON 1=1
/* scanCount: 50099 */
WHERE B.TBL_A_ID = A.ID
GROUP BY B.TBL_A_ID
HAVING A.ACTIVE = TRUE
/*
TBL_B.TBL_B_IDX read: 46
*/
(1 row, 25 ms)
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