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https://issues.apache.org/jira/browse/CALCITE-4694?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17390682#comment-17390682
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Julian Hyde commented on CALCITE-4694:
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I could make the internal constructor protected but annotate it as
experimental. Experimental means it may change without notice in future, which
of course could break Hive. It's a trade-off, but in my opinion Hive's decision
to sub-class a class with a non-trivial constructor creates rather much
coupling, so Hive should pay some of the price.
> When creating a RelOptMaterialization, if row types are not identical, create
> a cast using a custom RelBuilder
> --------------------------------------------------------------------------------------------------------------
>
> Key: CALCITE-4694
> URL: https://issues.apache.org/jira/browse/CALCITE-4694
> Project: Calcite
> Issue Type: Improvement
> Components: core
> Affects Versions: 1.25.0
> Reporter: Krisztian Kasa
> Assignee: Krisztian Kasa
> Priority: Minor
> Labels: pull-request-available
> Fix For: 1.28.0
>
> Time Spent: 20m
> Remaining Estimate: 0h
>
> RelOptMaterialization may add a Project on top of tableRel. This is always a
> LogicalProject since the RelFactories.ProjectFactory is hardcoded to
> RelFactories.DEFAULT_PROJECT_FACTORY.
> Some projects like Hive specifies its custom operators and custom
> RelFactories instead of using the built in Logical ones.
> Example:
> {code:java}
> public class HiveProject extends Project
> {code}
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