Julian Hyde created CALCITE-842:
-----------------------------------
Summary: Decorrelator gets field offsets confused if fields have
been trimmed
Key: CALCITE-842
URL: https://issues.apache.org/jira/browse/CALCITE-842
Project: Calcite
Issue Type: Bug
Reporter: Julian Hyde
Assignee: Julian Hyde
Decorrelator gets field offsets confused if fields have been trimmed. The query
{code}select empno from "scott".emp as e
join "scott".dept as d using (deptno)
where e.sal in (
select e2.sal from "scott".emp as e2 where e2.deptno > e.deptno);
{code} gives the stack {noformat}Caused by: java.lang.NullPointerException
at
org.apache.calcite.sql2rel.RelDecorrelator.createValueGenerator(RelDecorrelator.java:746)
at
org.apache.calcite.sql2rel.RelDecorrelator.decorrelateInputWithValueGenerator(RelDecorrelator.java:856)
at
org.apache.calcite.sql2rel.RelDecorrelator.decorrelateRel(RelDecorrelator.java:915)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at
org.apache.calcite.util.ReflectUtil.invokeVisitorInternal(ReflectUtil.java:256)
at
org.apache.calcite.util.ReflectUtil.invokeVisitor(ReflectUtil.java:213)
at
org.apache.calcite.util.ReflectUtil$1.invokeVisitor(ReflectUtil.java:476)
at
org.apache.calcite.sql2rel.RelDecorrelator$DecorrelateRelVisitor.visit(RelDecorrelator.java:1434)
{noformat}
The workaround is to disable trimming in SqlToRelConverter and do it only after
sub-queries have been expanded and de-correlated. Search for references to this
bug number introduced in the fix to CALCITE-816.
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