当我运行持久查询[1]以根据子查询的结果更新几何列时,出现以下错误“无效的内存分配请求大小1073741824”。
有人知道如何解决此错误吗?还是如何修改更新查询以生成几何的更好方法?
[1]
UPDATE hp
SET the_geom = lines.the_geom
FROM (
SELECT hp_id, st_makeline(the_geom) the_geom
FROM (
SELECT hp_id, st_collect(the_geom) the_geom
FROM (
SELECT sbp.hp_id, point_sequence, sobr.the_geom
FROM sbp
JOIN sobr ON sbp.bp_id=sobr.id
ORDER BY hp_id, point_sequence
) t
GROUP BY hp_id
) tt
GROUP BY hp_id) lines
WHERE lines.hp_id = hp.id AND hp.the_geom IS NULL;
这是查询计划:
Update on hp (cost=133655367.27..139530992.38 rows=1 width=268)
-> Nested Loop (cost=133655367.27..139530992.38 rows=1 width=268)
-> Subquery Scan on lines (cost=133655366.69..139529271.88 rows=200 width=104)
-> GroupAggregate (cost=133655366.69..139529269.88 rows=200 width=40)
Group Key: sbp.hp_id
-> GroupAggregate (cost=133655366.69..139510248.44 rows=1267929 width=40)
Group Key: sbp.hp_id
-> Sort (cost=133655366.69..134489514.21 rows=333659008 width=48)
Sort Key: sbp.hp_id, sbp.poradove_cislo_bodu
-> Hash Join (cost=7282892.98..76155670.90 rows=333659008 width=48)
Hash Cond: (sbp.bp_id = sobr.id)
-> Seq Scan on sbp (cost=0.00..8104984.08 rows=333659008 width=24)
-> Hash (cost=4761304.88..4761304.88 rows=124139688 width=40)
-> Seq Scan on sobr (cost=0.00..4761304.88 rows=124139688 width=40)
-> Index Scan using hp_id_key on hp (cost=0.57..8.59 rows=1 width=172)
Index Cond: (id = lines.hp_id)
Filter: (the_geom IS NULL)
感谢所有建议!
答案 0 :(得分:0)
我认为您正在采取不必要的步骤,我会尝试:
SET the_geom = lines.the_geom
FROM (
SELECT sbp.hp_id,
st_makeline(sobr.the_geom ORDER BY hp_id, point_sequence) as the_geom
FROM sbp
JOIN sobr
ON sbp.bp_id=sobr.id
GROUP BY hp_id
) lines
WHERE lines.hp_id = hp.id AND hp.the_geom IS NULL;
但是如果没有样本数据,我不能百分百确定它会起作用