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https://issues.apache.org/jira/browse/CALCITE-5967?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Ruben Q L updated CALCITE-5967:
-------------------------------
Summary: UnsupportedOperationException while implementing a call that
requires a special collator (was: UnsupportedOperationException while
implementing call that requires a special collator )
> UnsupportedOperationException while implementing a call that requires a
> special collator
> -----------------------------------------------------------------------------------------
>
> Key: CALCITE-5967
> URL: https://issues.apache.org/jira/browse/CALCITE-5967
> Project: Calcite
> Issue Type: Bug
> Components: core
> Reporter: Ruben Q L
> Assignee: Ruben Q L
> Priority: Major
> Fix For: 1.36.0
>
>
> Regression introduced by a minor change within CALCITE-5914, detected while
> testing a downstream project with the latest Calcite main.
> CALCITE-5914 (see
> [2a96512c|https://github.com/apache/calcite/commit/2a96512c352bda4a5d9c0c80730f5c115ac363d6])
> introduced this apparently innocuous change in
> {{RexImpTable#AbstractRexCallImplementor#unboxIfNecessary}}:
> {code}
> // old
> argValueList.stream()
> .map(AbstractRexCallImplementor::unboxExpression)
> .collect(Collectors.toList());
> =>
> // new
> Util.transform(argValueList,
> AbstractRexCallImplementor::unboxExpression);
> {code}
> Both expressions seem equivalent, however there is a subtle difference: the
> old one returns an {{ArrayList}} (where we can add new elements); whereas the
> new one returns a {{TransformingList}} that extends {{AbstractList}} and that
> does not support {{List#add}}.
> After calling {{unboxIfNecessary}}, we might need to modify the argument list
> if we need a special collator to perform the operation:
> {code}
> private ParameterExpression genValueStatement(...) {
> ...
> optimizedArgValueList = unboxIfNecessary(optimizedArgValueList);
> final Expression callValue =
> implementSafe(translator, call, optimizedArgValueList);
> ...
> }
> @Override Expression implementSafe(...) {
> ...
> final Expression fieldComparator =
> generateCollatorExpression(relDataType0.getCollation());
> if (fieldComparator != null) {
> argValueList.add(fieldComparator); // <---
> UnsupportedOperationException!
> }
> ...
> {code}
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