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https://issues.apache.org/jira/browse/FLINK-7987?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16240064#comment-16240064
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Fabian Hueske commented on FLINK-7987:
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Would we lose validation when there is no schema associated with the
{{RexBuilder}} or is there no validation happening anyway?
Btw. a shortcut to constructing a table and scan node, is adding a values node.
> Use RexBuilder when converting Expression to RexNode
> ----------------------------------------------------
>
> Key: FLINK-7987
> URL: https://issues.apache.org/jira/browse/FLINK-7987
> Project: Flink
> Issue Type: Improvement
> Components: Table API & SQL
> Reporter: Kurt Young
>
> Currently, when converting {{Expression}} to {{RexNode}}, we passed in a
> {{RelBuilder}}, which is more complex to construct than {{RexBuilder}}. E.g.
> we need to push a fake table and a fake select node into RelBuilder, in order
> to get input type information.
> I think in this case, {{RexBuilder}} will be enough for generating
> {{RexNode}}.
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