Hive Explode / Lateral View multiple arrays

Question

I have a hive table with the following schema:

COOKIE  | PRODUCT_ID | CAT_ID |    QTY    
1234123   [1,2,3]    [r,t,null]  [2,1,null]

How

Answer 1

You can do this by using posexplode, which will provide an integer between 0 and n to indicate the position in the array for each element in the array. Then use this integer - call it pos (for position) to get the matching values in other arrays, using block notation, like this:

select 
  cookie, 
  n.pos as position, 
  n.prd_id as product_id,
  cat_id[pos] as catalog_id,
  qty[pos] as qty
from table
lateral view posexplode(product_id_arr) n as pos, prd_id;

This avoids the using imported UDF's as well as joining various arrays together (this has much better performance).