[HIVE-22816] QueryCache: Queries using views can have them cached after CTE expansion

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 4.0.0-alpha-1
• Component/s: Query Processor
• Assignee: Gopal Vijayaraghavan
• Reporter: Gopal Vijayaraghavan
• Created: 01/Feb/20 07:27
• Updated: 27/Feb/24 22:23
• Resolved: 21/Feb/20 04:01

Description

create view ss_null as select * from store_Sales where ss_Sold_date_sk is null;

select count(ss_ticket_number) from ss_null;

with ss_null_cte as 
(select * from store_Sales where ss_Sold_date_sk is null)
select count(ss_ticket_number) from ss_null_cte;

Are treated differently by the query cache, however their execution is identical.

CBO rewrites the view query into AST form as follows

SELECT COUNT(`ss_ticket_number`) AS `$f0`
FROM `tpcds_bin_partitioned_acid_orc_10000`.`store_sales`
WHERE `ss_sold_date_sk` IS NULL

But retains the write-entity for the VIRTUAL_VIEW for Ranger authorization

0: jdbc:hive2://localhost:10013> explain dependency select count(distinct ss_ticket_number) from ss_null;

+----------------------------------------------------+
|                      Explain                       |
+----------------------------------------------------+
| {"input_tables":[{"tablename":"tpcds_bin_partitioned_acid_orc_10000@ss_null","tabletype":"VIRTUAL_VIEW"},{"tablename":"tpcds_bin_partitioned_acid_orc_10000@store_sales","tabletype":"MANAGED_TABLE","tableParents":"[tpcds_bin_partitioned_acid_orc_10000@ss_null]"}],"input_partitions":[{"partitionName":"tpcds_bin_partitioned_acid_orc_10000@store_sales@ss_sold_date_sk=__HIVE_DEFAULT_PARTITION__"}]} |
+----------------------------------------------------+

Causing Query cache to print out

parse.CalcitePlanner: Not eligible for results caching - query contains non-transactional tables [ss_null]