[jira] [Updated] (CALCITE-4910) Enhance simplify to reduce ((A OR D) AND (A OR C) AND A AND B) to (A AND B)

["Ziwei Liu (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/CALCITE-4910?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Ziwei Liu updated CALCITE-4910:
-------------------------------
    Summary: Enhance simplify to reduce ((A OR D) AND (A OR C) AND A AND B) to (A AND B)  (was: Enhance simplify to reduce ((a or d) and (a or c) and a and b) to (a and b))

> Enhance simplify to reduce ((A OR D) AND (A OR C) AND A AND B) to (A AND B)
> ---------------------------------------------------------------------------
>
>                 Key: CALCITE-4910
>                 URL: https://issues.apache.org/jira/browse/CALCITE-4910
>             Project: Calcite
>          Issue Type: Improvement
>            Reporter: Ziwei Liu
>            Assignee: Ziwei Liu
>            Priority: Major
>              Labels: pull-request-available
>          Time Spent: 10m
>  Remaining Estimate: 0h
>
> Considering this condition, (a or d) and (a or c) and a and b. This condition can be simplified to a and b, but now simplify can not do this.
> This case is found out by materialized view test:
> {code:java}
> materialized view: 
> select 'a',empid,deptno,salary as s from emps where (replace(name,'e','a') is not null or replace(name,'a','c') is not null) 
> and (replace(name,'c','b') is not null or replace(name,'n','d') is not null)
> sql:  
> select salary +1 as s,deptno from emps where
> replace(name,'c','b')is not null and replace(name,'a','c') is not null and salary>10
> The sql will not be rewritten by materialized view because when splitFilter, 
> $3 > 10 and REPLACE($2, 'a', 'c') is not null and REPLACE($2, 'c', 'b') is not null and  (REPLACE($2, 'a', 'c') is not null or REPLACE($2, 'e', 'a') is not null) 
> and (REPLACE($2, 'c', 'b') is not null or REPLACE($2, 'n', 'd') is not null)
> can not be simplified to  
> $3 > 10 and REPLACE($2, 'a', 'c') is not null and REPLACE($2, 'c', 'b') is not null 
> materialized view:
> select empid,deptno,salary as s from emps where 
> (replace(name,'e','a') ='aaa' or replace(name,'a','c') ='aaa') 
> and 
> (replace(name,'c','b') ='aaa' or replace(name,'n','d') ='aaa')
> sql:
> select salary  as s,deptno from emps where
> replace(name,'c','b') ='aaa' is not null 
> and replace(name,'a','c') ='aaa'
> This case also can not be rewritten.{code}



--
This message was sent by Atlassian Jira
(v8.20.1#820001)