impala对元数据的界面更新操作

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　　执行 impala-shell 即能进入界面操作sql。如果在hive更新了数据之后，而在impala中却无法看到更新后的数据的话，意味着impala里元数据信息还没有刷新，此时在impala操作界面里 执行 invalidate metadata; 命令刷新元数据。

use rimengshe;

CREATE TABLE if NOT EXISTS dw_serv_checi_query_day (

user_id string,

railway_no string,

start_station string

) PARTITIONED BY (

dt STRING

)

ROW FORMAT DELIMITED FIELDS TERMINATED BY '\t' STORED AS TEXTFILE;

ALTER TABLE dw_serv_checi_query_day ADD PARTITION (dt = ${partdt});

insert into dw_serv_checi_query_day partition(dt='20190101') values('1','2','3');

select * from dw_serv_checi_query_day;

select count(*) from dw_serv_checi_query_day;