Impala: argument of type "NoneType" does not repeat

Question

I imported a table from MySQL, which has 10 million rows in Hive and now performs some operations in Impala to test functionality and performance. Now I get an error argument of type 'NoneType' is not iterablewhen I issue the following request.

select count(id) from my_table_name;

Is there anything I need to do after importing the data to fix this? I intend to use Impala mainly for analytics, and therefore it includes many SUM and COUNT functions.

Answer 1

refresh. Cloudera:

:

REFRESH [db_name.] _ :

REFRESH :

HDFS . ( ETL Impala, , , , .) ALTER TABLE, INSERT, LOAD DATA SQL, , Hive.