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https://issues.apache.org/jira/browse/CALCITE-3165?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16876315#comment-16876315
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Ruben Quesada Lopez commented on CALCITE-3165:
----------------------------------------------
Currently, Project#accept(RexShuttle shuttle) does:
{code}
public RelNode accept(RexShuttle shuttle) {
List<RexNode> exps = shuttle.apply(this.exps);
if (this.exps == exps) {
return this;
}
return copy(traitSet, getInput(), exps, rowType);
}
{code}
Thus, the original rowType is always kept, even though we know that the list of
expressions has been changed, so we might have potentially a different rowType.
The idea would be doing something in the line of:
{code}
public RelNode accept(RexShuttle shuttle) {
List<RexNode> exps = shuttle.apply(this.exps);
if (this.exps == exps) {
return this;
}
final RelDataType newRowType =
RexUtil.createStructType(
getInput().getCluster().getTypeFactory(),
exps,
rowType.getFieldNames(),
SqlValidatorUtil.F_SUGGESTER);
return copy(traitSet, getInput(), exps, newRowType);
}
{code}
I'll try to provide a unit test to show the problem.
> Project#accept(RexShuttle shuttle) does not update rowType
> ----------------------------------------------------------
>
> Key: CALCITE-3165
> URL: https://issues.apache.org/jira/browse/CALCITE-3165
> Project: Calcite
> Issue Type: Bug
> Components: core
> Reporter: Ruben Quesada Lopez
> Assignee: Ruben Quesada Lopez
> Priority: Minor
>
> {{Project#accept(RexShuttle shuttle)}} can return a copy of the original
> Project, if the list of expressions is modified by the shuttle. However, this
> Project copy will maintain the original rowType, which might be wrong because
> this type is based on the expressions list (which was modified by the shuttle)
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