索引未在我的查询中命中（PostgreSQL）

Question

您好，我有以下查询（我使用CURRENT_DATE进行查询演示，稍后它将作为函数的参数）：

SELECT *
FROM FOO_TBL
WHERE FOO_VERSION_FROM <= CURRENT_DATE
AND (FOO_VERSION_TO >= CURRENT_DATE) OR (FOO_VERSION_TO IS NULL)) 
AND (FOO_ACTIVE_FROM IS NOT NULL)
ORDER BY ID;

我已经创建了这样的索引：

CREATE INDEX FOO_IDX ON FOO_TBL (FOO_VERSION_FROM, FOO_VERSION_TO, FOO_ACTIVE_FROM )

对该查询的解释（分析，缓冲区）命令输出：

"Sort  (cost=7171052.33..7173000.95 rows=979450 width=6999) (actual time=2135.384..2364.861 rows=979517 loops=1)"
"  Sort Key: ID"
"  Sort Method: external merge  Disk: 212224kB"
"  Buffers: shared hit=10380 read=47568, temp read=61082 written=61166"
"  I/O Timings: read=269.324"
"  ->  Seq Scan on plain_subjekt subjekt  (cost=0.00..77435.98 rows=979450 width=6999) (actual time=0.175..733.647 rows=979517 loops=1)"
"        Filter: ((FOO_VERSION_FROM <= CURRENT_DATE) AND ((FOO_VERSION_TO >= CURRENT_DATE) OR (FOO_VERSION_TO IS NULL)) AND (FOO_ACTIVE_FROM IS NOT NULL))"
"        Rows Removed by Filter: 2"
"        Buffers: shared hit=10380 read=47568"
"        I/O Timings: read=269.324"
"Planning time: 0.156 ms"
"Execution time: 2410.941 ms"

我做错了什么？