[jira] [Created] (CALCITE-457) Non-ansi join should not be processed as a filter on top of "on (true)" join

["Vladimir Sitnikov (JIRA)" <ji...@apache.org>]

Vladimir Sitnikov created CALCITE-457:
-----------------------------------------

             Summary: Non-ansi join should not be processed as a filter on top of "on (true)" join
                 Key: CALCITE-457
                 URL: https://issues.apache.org/jira/browse/CALCITE-457
             Project: Calcite
          Issue Type: Bug
    Affects Versions: 0.9.1-incubating
            Reporter: Vladimir Sitnikov
            Assignee: Julian Hyde


I've tested two plans and it turns out the query with non-ansi joins has extremely bad plan (note {{EnumerableJoinRel(condition=\[true\]}}):
{code:sql}
explain plan for select d."deptno", e."empid"
from "hr"."emps" as e
  , "hr"."depts" as d
where e."deptno" = d."deptno"+0

PLAN=EnumerableCalcRel(expr#0..2=[{inputs}], expr#3=[CAST($t1):INTEGER NOT NULL], expr#4=[0], expr#5=[+($t2, $t4)], expr#6=[=($t3, $t5)], deptno=[$t2], empid=[$t0], $condition=[$t6])
  EnumerableJoinRel(condition=[true], joinType=[inner])
    EnumerableCalcRel(expr#0..4=[{inputs}], proj#0..1=[{exprs}])
      EnumerableTableAccessRel(table=[[hr, emps]])
    EnumerableCalcRel(expr#0..2=[{inputs}], deptno=[$t0])
      EnumerableTableAccessRel(table=[[hr, depts]])
{code}

Same works fine with ANSI style:
{code:sql}
explain plan for select d."deptno", e."empid"
from "hr"."emps" as e
  join "hr"."depts" as d
 on (e."deptno" = d."deptno"+0)

PLAN=EnumerableCalcRel(expr#0..3=[{inputs}], deptno=[$t2], empid=[$t0])
  EnumerableJoinRel(condition=[=($1, $3)], joinType=[inner])
    EnumerableCalcRel(expr#0..4=[{inputs}], expr#5=[CAST($t1):INTEGER NOT NULL], empid=[$t0], $f5=[$t5])
      EnumerableTableAccessRel(table=[[hr, emps]])
    EnumerableCalcRel(expr#0..2=[{inputs}], expr#3=[0], expr#4=[+($t0, $t3)], deptno=[$t0], $f3=[$t4])
      EnumerableTableAccessRel(table=[[hr, depts]])
{code}

The query that does not use calculations works fine even with non-ansi style:
{code:sql}
explain plan for select d."deptno", e."empid"
from "hr"."emps" as e
  , "hr"."depts" as d
where e."deptno" = d."deptno"

PLAN=EnumerableCalcRel(expr#0..2=[{inputs}], deptno=[$t2], empid=[$t0])
  EnumerableJoinRel(condition=[=($1, $2)], joinType=[inner])
    EnumerableCalcRel(expr#0..4=[{inputs}], proj#0..1=[{exprs}])
      EnumerableTableAccessRel(table=[[hr, emps]])
    EnumerableCalcRel(expr#0..2=[{inputs}], deptno=[$t0])
      EnumerableTableAccessRel(table=[[hr, depts]])
{code}



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