Jesus Camacho Rodriguez created CALCITE-2074:
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Summary: Simplification of AND/OR expressions yields wrong results
Key: CALCITE-2074
URL: https://issues.apache.org/jira/browse/CALCITE-2074
Project: Calcite
Issue Type: Bug
Components: core
Affects Versions: 1.15.0
Reporter: Jesus Camacho Rodriguez
Assignee: Julian Hyde
Discovered while testing 1.15.0 RC0 with Hive. It seems this regression was
introduced by CALCITE-1995.
Consider the following query:
{code}
select * from (
select a.*,b.d d1,c.d d2 from
t1 a join t2 b on (a.id1 = b.id)
join t2 c on (a.id2 = b.id) where b.d <= 1 and c.d <= 1
) z where d1 > 1 or d2 > 1
{code}
We end up generating the following plan:
{code}
HiveProject(id1=[$0], id2=[$1], d1=[$3], d2=[$4])
HiveJoin(condition=[OR(=($3, 1), =($4, 1))], joinType=[inner],
algorithm=[none], cost=[not available])
HiveJoin(condition=[AND(=($0, $2), =($1, $2))], joinType=[inner],
algorithm=[none], cost=[not available])
HiveFilter(condition=[AND(IS NOT NULL($0), IS NOT NULL($1))])
HiveProject(id1=[$0], id2=[$1])
HiveTableScan(table=[[default.t1]], table:alias=[a])
HiveFilter(condition=[AND(<=($1, 1), IS NOT NULL($0))])
HiveProject(id=[$0], d=[$1])
HiveTableScan(table=[[default.t2]], table:alias=[b])
HiveFilter(condition=[<=($0, 1)])
HiveProject(d=[$1])
HiveTableScan(table=[[default.t2]], table:alias=[c])
{code}
Observe that the condition in the top join is not correct.
I can reproduce this in {{RexProgramTest.simplifyFilter}} with the following
example:
{code}
// condition "a > 5 or b > 5"
// with pre-condition "a <= 5 and b <= 5"
// should yield "false" but yields "a = 5 or b = 5"
checkSimplifyFilter(or(gt(aRef, literal5),gt(bRef, literal5)),
RelOptPredicateList.of(rexBuilder,
ImmutableList.of(le(aRef, literal5), le(bRef, literal5))),
"false");
{code}
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