我有下面的Cassandra表:
CREATE TABLE myflights.flights_by_airport2 (
origin text,
dep_time timestamp,
fl_date timestamp,
airline_id int,
carrier text,
fl_num int,
PRIMARY KEY ((origin), dep_time)
) WITH CLUSTERING ORDER BY (dep_time ASC);
cqlsh:myflights> select * from flights_by_airport2 limit 5;
origin | dep_time | airline_id | carrier | fl_date | fl_num
--------+---------------------------------+------------+---------+---------------------------------+--------
MSY | 2012-01-01 05:57:00.000000+0000 | 19977 | UA | 2012-01-01 00:00:00.000000+0000 | 275
MSY | 2012-01-01 06:01:00.000000+0000 | 20409 | B6 | 2012-01-01 00:00:00.000000+0000 | 110
MSY | 2012-01-01 06:13:00.000000+0000 | 19790 | DL | 2012-01-01 00:00:00.000000+0000 | 551
MSY | 2012-01-01 06:45:00.000000+0000 | 19805 | AA | 2012-01-01 00:00:00.000000+0000 | 1190
MSY | 2012-01-01 06:46:00.000000+0000 | 19977 | UA | 2012-01-01 00:00:00.000000+0000 | 1184
以下语句不返回任何数据:
cqlsh:myflights> select * from flights_by_airport2 where origin = 'MSY';
origin | dep_time | airline_id | carrier | fl_date | fl_num
--------+----------+------------+---------+---------+--------
(0 rows)
我在Ubuntu VM上安装了单节点Cassandra和Spark (DSE6集群)。
发布于 2018-05-28 12:18:31
因为我的评论已经得到了答案,所以我将把它作为答案发布:
我将首先通过运行以下命令来检查它是否是空格问题
select * from flights_by_airport2 where origin contains 'MSY';
如果这仍然是一个问题,那么您可以尝试使用trim
,或者只是清理数据。
https://stackoverflow.com/questions/50556646
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