[ https://issues.apache.org/jira/browse/HIVE-20557?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Gopal V updated HIVE-20557: --------------------------- Component/s: CBO > Constant Folding: null > (expr) is not constant folded to NULL > -------------------------------------------------------------- > > Key: HIVE-20557 > URL: https://issues.apache.org/jira/browse/HIVE-20557 > Project: Hive > Issue Type: Improvement > Components: CBO > Affects Versions: 3.1.0, 4.0.0 > Reporter: Gopal V > Priority: Major > > {code} > create temporary table foo(col1 int, col2 int, col3 int, col5 int, col9 int) > stored as orc; > explain select count(1) from foo where > CASE WHEN (col5 is not null) THEN (((col1 / col5) > (col9 / col3))) ELSE > ((null > (col9 / col3))) END; > explain select count(1), max((col9/col3) > null) from foo where > CASE WHEN (col5 is not null) THEN (((col1 / col5) > (col9 / col3))) ELSE > (((col9 / col3) > null)) END; > {code} > There's no sane way to write this query, but this is actually generated by > CBO for an expression which looks like > {code} > case when t_w_firstyear.year_total > 0 then t_w_secyear.year_total / > t_w_firstyear.year_total else null end > > case when t_s_firstyear.year_total > 0 then > t_s_secyear.year_total / t_s_firstyear.year_total else null end > {code} -- This message was sent by Atlassian JIRA (v7.6.3#76005)