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https://issues.apache.org/jira/browse/CALCITE-4103?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Haisheng Yuan resolved CALCITE-4103.
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Resolution: Not A Problem
It is not worthwhile doing.
> SetOp and Union should accept RelNode subclasses in the constructor
> -------------------------------------------------------------------
>
> Key: CALCITE-4103
> URL: https://issues.apache.org/jira/browse/CALCITE-4103
> Project: Calcite
> Issue Type: Improvement
> Components: core
> Reporter: Haisheng Yuan
> Priority: Major
>
> Currently only list of RelNode is accepted:
> {code:java}
> protected SetOp(RelOptCluster cluster, RelTraitSet traits,
> List<RelNode> inputs, SqlKind kind, boolean all) {}
> {code}
> If I have a List of EnumerableTableScan, the compiler will complain. It might
> be better to change to List<? extends RelNode>. I think this can still keep
> the backward compatibility.
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