CREATE EXTERNAL TABLE old_events
(day STRING, foo STRING, count STRING, internal_id STRING)
PARTITIONED BY (ds string)
ROW FORMAT DELIMITED
FIELDS TERMINATED BY '\t'
LOCATION '${INPUT}';

CREATE EXTERNAL TABLE events
(internal_id, foo STRING, count STRING)
PARTITIONED BY (ds string)
ROW FORMAT DELIMITED
FIELDS TERMINATED BY '\t'
LOCATION '${OUTPUT}';

INSERT OVERWRITE TABLE events
SELECT e2.internal_id, e2.foo, count(e1.foo)
FROM old_events e2
LEFT OUTER JOIN old_events e1
ON e1.foo = e2.foo
WHERE e1.event = 'event1'
AND e2.event = 'event2'
AND ds = date_sub('${DAY}',1)
GROUP BY e2.internal_id, e2.foo;

失败：语义分析出错：在多个表/子查询中找到列ds
我在添加获取当前日期的ds变量时遇到了这个错误。如何使用上面的脚本实现日期分区。