Details
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Bug
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Status: Open
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Major
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Resolution: Unresolved
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1.32.0
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None
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None
Description
The problem has been found inside CALCITE-5388. The following query can return wrong result:
with CTE1(rand1, val1) as ( select RAND_INTEGER(2), id from (values (1), (2)) as Vals1(id) ), CTE2(rand2, val2) as ( select RAND_INTEGER(2), id from (values (1), (2)) as Vals2(id) ) select CTE1.rand1, CTE1.val1, CTE2.rand2, CTE2.val2 from CTE1, CTE2 where CTE1.rand1 = CTE2.rand2
For instance it can return:
RAND1 | VAL1 | RAND2 | VAL2 |
1 | 1 | 1 | 1 |
0 | 1 | 1 | 2 |
The problem is that EnumerableCalc generates Enumerable class that uses non-idempotent function `randInteger` inside 'current()' method:
new org.apache.calcite.linq4j.AbstractEnumerable() { public org.apache.calcite.linq4j.Enumerator enumerator() { return new org.apache.calcite.linq4j.Enumerator() { <.........> public Object current() { return new Object[]{ $L4J$C$new_org_apache_calcite_runtime_RandomFunction_.randInteger(2), org.apache.calcite.runtime.SqlFunctions.toInt(inputEnumerator.current())}; } static final org.apache.calcite.runtime.RandomFunction $L4J$C$new_org_apache_calcite_runtime_RandomFunction_ = new org.apache.calcite.runtime.RandomFunction(); }; } };
if current() is called twice it can produce different results. What exactly happens inside EnumerableDefault.hashEquiJoin_ function (outers.current() is called inside moveNext() and current())
Attachments
Issue Links
- is related to
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CALCITE-5388 tempList expression inside EnumerableWindow.getPartitionIterator should be unoptimized
- Closed