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https://issues.apache.org/jira/browse/CALCITE-6117?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17785705#comment-17785705
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Tanner Clary commented on CALCITE-6117:
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So how does it currently unparse? Is it always wrong?
> Unparsing SAFE_CAST is broken
> -----------------------------
>
> Key: CALCITE-6117
> URL: https://issues.apache.org/jira/browse/CALCITE-6117
> Project: Calcite
> Issue Type: Bug
> Reporter: Will Noble
> Priority: Trivial
>
> BigQuery's {{SAFE_CAST}} function operates much like {{CAST}}. Currently, the
> unparsing logic is broken because it does not use the [special logic for
> {{CAST}}|https://github.com/apache/calcite/blob/94dc1673da824174f9271677ead73cfae1aeb29b/core/src/main/java/org/apache/calcite/rel/rel2sql/SqlImplementor.java#L816]
> in {{SqlImplementor.callToSql}} that turns the rex call's return type into
> the sql call's second argument.
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