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https://issues.apache.org/jira/browse/CALCITE-6651?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17896145#comment-17896145
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suibianwanwan commented on CALCITE-6651:
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[~nobigo] I've updated it. The problem previously mentioned by JIRA has been
fixed in CALCITE-6350
> Use RelBuilder in SqlToRelConverter to construct Union
> ------------------------------------------------------
>
> Key: CALCITE-6651
> URL: https://issues.apache.org/jira/browse/CALCITE-6651
> Project: Calcite
> Issue Type: Bug
> Reporter: suibianwanwan
> Assignee: suibianwanwan
> Priority: Major
> Labels: pull-request-available
>
> In RelToSqlConverter, some unions are created using LogicalUnion.create() and
> some are relBuilder.union(). In RelBuilder.union we configure simplifyValues
> to control whether or not the {_}Union(Project(Values))} to{_}{*}_{@code_{*}
> _Values}._
> {code:java}
> /** Whether to simplify {@code Union(Values, Values)} or
> * {@code Union(Project(Values))} to {@code Values}; default true. */
> @Value.Default default boolean simplifyValues() {
> return true;
> }{code}
> This will cause the configuration to not take effect where
> LogicalUnion.create() is called.
> For example:
> {code:java}
> select * from (select 'word' i union all select 'w' i)
> {code}
> Result:
> {code:java}
> LogicalUnion(all=[true])
> LogicalValues(tuples=[[{ 'word' }]])
> LogicalValues(tuples=[[{ 'w ' }]])
> {code}
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