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https://issues.apache.org/jira/browse/CALCITE-3475?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16967094#comment-16967094
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Steven Talbot commented on CALCITE-3475:
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Linked a proposed fix in [https://github.com/apache/calcite/pull/1559]
> BigQuery SQL dialect unparseCall override broken for UNION ALL
> --------------------------------------------------------------
>
> Key: CALCITE-3475
> URL: https://issues.apache.org/jira/browse/CALCITE-3475
> Project: Calcite
> Issue Type: Bug
> Reporter: Steven Talbot
> Assignee: Julian Hyde
> Priority: Major
> Fix For: 1.22.0
>
>
> The break on line
> [https://github.com/apache/calcite/blob/ff43dcb95caa251e5fc8120980fc70c8fea8ac40/core/src/main/java/org/apache/calcite/sql/dialect/BigQuerySqlDialect.java#L134]
> should be inside the if. Otherwise, UNION ALL does not trigger the if, hits
> the `break`, and then nothing is unparsed at all!
>
> From looking at the code, INTERSECT and EXCEPT would seem to have the same
> problem, except per BQ syntax specification at
> [https://cloud.google.com/bigquery/docs/reference/standard-sql/query-syntax#set-operators],
> the "ALL" is not supported with either of those, so it may not matter (but
> the code may want to explicitly blow up, saying that those aren't supported?)
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