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https://issues.apache.org/jira/browse/CALCITE-4910?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Ziwei Liu updated CALCITE-4910:
-------------------------------
Description:
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
{code}
was:
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}
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
{code}
> 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
>
> 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
>
> {code}
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