I'm trying to run a query on Amazon EMR using HiveQL. The table structure is as follows:
parentId INT, ARRAY : STRUCT : childId:INT, category:INT
I want to be able to group by combination of parentId and childId, how do I do that? Do I need to export the table to another table so each parentId and childId becomes its own row? or is there a better way?
Thanks in advance!
Figured this out:
<pre>
SELECT parentId, array_items.childId , array_items.category
FROM table LATERAL VIEW explode(array) exploded_table as array_items;
</pre>
does the trick. Thanks @libjack
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