Amy created HAWQ-1339:
-------------------------
Summary: Cache lookup failed after explain OLAP grouping query
Key: HAWQ-1339
URL: https://issues.apache.org/jira/browse/HAWQ-1339
Project: Apache HAWQ
Issue Type: Bug
Components: Catalog
Reporter: Amy
Assignee: Ed Espino
Fix For: 2.3.0.0-incubating
Some OLAP grouping query may error out with "division by zero", and when do
query explain, notice of "cache lookup failed for attribute 7 of relation 75036
(lsyscache.c:437)" occurred.
'''
postgres=# SELECT sale.vn,sale.cn,sale.dt,GROUPING(sale.vn),
TO_CHAR(COALESCE(MAX(DISTINCT
floor(sale.vn+sale.qty)),0),'99999999.9999999'),TO_CHAR(COALESCE(VAR_SAMP(floor(sale.pn/sale.prc)),0),'99999999.9999999'),TO_CHAR(COALESCE(COUNT(floor(sale.qty+sale.prc)),0),'99999999.9999999')
postgres-# FROM sale,customer,vendor
postgres-# WHERE sale.cn=customer.cn AND sale.vn=vendor.vn
postgres-# GROUP BY
ROLLUP((sale.prc),(sale.vn,sale.vn),(sale.pn,sale.pn),(sale.dt),(sale.qty,sale.vn,sale.qty)),ROLLUP((sale.pn),(sale.vn,sale.pn),(sale.qty)),(),sale.cn
HAVING COALESCE(VAR_POP(sale.cn),0) >= 45.5839785564113;
ERROR: division by zero (seg0 localhost:40000 pid=25205)
postgres=#
postgres=# explain SELECT sale.vn,sale.cn,sale.dt,GROUPING(sale.vn),
TO_CHAR(COALESCE(MAX(DISTINCT floor
'9 99. FROM sale,customer,vendor
WHERE sale.cn=customer.cn AND
sale.vn=vendor.vn GROUP BY
ROLLUP((sale.prc),(sale.vn,sale.vn),(sale.pn,sale.pn),(sale.dt),(sale.qty,sale.vn,sale.qty)),ROLLUP((sale.pn),(sale.vn,sale.pn),(sale.qty)),(),sale.cn
HAVING COALESCE(VAR_POP(sale.cn),0) >= 45.5839785564113;
NOTICE: cache lookup failed for attribute 7 of relation 75036 (lsyscache.c:437)
'''
The reproduction steps are:
'''
Step 1: Prepare schema and data using attached olap_setup.sql
Step 2: Run below OLAP grouping query
-- OLAP query involving MAX() function
SELECT sale.vn,sale.cn,sale.dt,GROUPING(sale.vn), TO_CHAR(COALESCE(MAX(DISTINCT
floor(sale.vn+sale.qty)),0),'99999999.9999999'),TO_CHAR(COALESCE(VAR_SAMP(floor(sale.pn/sale.prc)),0),'99999999.9999999'),TO_CHAR(COALESCE(COUNT(floor(sale.qty+sale.prc)),0),'99999999.9999999')
FROM sale,customer,vendor
WHERE sale.cn=customer.cn AND sale.vn=vendor.vn
GROUP BY
ROLLUP((sale.prc),(sale.vn,sale.vn),(sale.pn,sale.pn),(sale.dt),(sale.qty,sale.vn,sale.qty)),ROLLUP((sale.pn),(sale.vn,sale.pn),(sale.qty)),(),sale.cn
HAVING COALESCE(VAR_POP(sale.cn),0) >= 45.5839785564113;
explain SELECT sale.vn,sale.cn,sale.dt,GROUPING(sale.vn),
TO_CHAR(COALESCE(MAX(DISTINCT
floor(sale.vn+sale.qty)),0),'99999999.9999999'),TO_CHAR(COALESCE(VAR_SAMP(floor(sale.pn/sale.prc)),0),'99999999.9999999'),TO_CHAR(COALESCE(COUNT(floor(sale.qty+sale.prc)),0),'99999999.9999999')
FROM sale,customer,vendor
WHERE sale.cn=customer.cn AND sale.vn=vendor.vn
GROUP BY
ROLLUP((sale.prc),(sale.vn,sale.vn),(sale.pn,sale.pn),(sale.dt),(sale.qty,sale.vn,sale.qty)),ROLLUP((sale.pn),(sale.vn,sale.pn),(sale.qty)),(),sale.cn
HAVING COALESCE(VAR_POP(sale.cn),0) >= 45.5839785564113;
'''
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