I am trying to fetch a count of total columns for a list of individual tables/views from Impala from the same schema.
however i wanted to scan through all the tables from that schema to capture the counts of columns of all the tables in a single query ?
i have already performed a similar exercise from Oracle Exa data ,however since i a new to Impala is there a way to capture all the tables in a single query ?
Exadata query for reference
# Oracle Exadata query i used
select owner, table_name as view_name, count(*) as counts
from dba_tab_cols /*DBA_TABLES_COLUMNS*/
where (owner, table_name) in
(
select owner, view_name
from dba_views /*DBA_VIEWS*/
where 1=1
and owner='DESIRED_SCHEMA_NAME'
)
group by owner ,table_name
order by counts desc;
impala /hive
DESCRIBE schemaName.tableName;
# Impala /Hive
how to find out ? if i need to run a single query check i was following the below
for multiple tables/view how to find out the total column counts ?
