amansinha100 commented on pull request #2823:
URL: https://github.com/apache/hive/pull/2823#issuecomment-981891264


   +1 
   I verified manually against a TPC-DS SF1 dataset that I have locally where 
the following query was previously hitting NPE and it works ok with this 
change. 
   
   Explain CBO
   with my_customers as (
    select distinct c_customer_sk
           , c_current_addr_sk
    from   
           ( select cs_sold_date_sk sold_date_sk,
                    cs_bill_customer_sk customer_sk,
                    cs_item_sk item_sk
             from   catalog_sales
             union all
             select ws_sold_date_sk sold_date_sk,
                    ws_bill_customer_sk customer_sk,
                    ws_item_sk item_sk
             from   web_sales
            ) cs_or_ws_sales,
            item,
            date_dim,
            customer
    where   sold_date_sk = d_date_sk
            and item_sk = i_item_sk
            and i_category = 'Books'
            and i_class = 'business'
            and c_customer_sk = cs_or_ws_sales.customer_sk
            and d_moy = 2
            and d_year = 2000
    )
   select * from my_customers;


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