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https://issues.apache.org/jira/browse/BEAM-9180?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17121712#comment-17121712
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Kenneth Knowles commented on BEAM-9180:
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This issue is assigned but has not received an update in 30 days so it has been
labeled "stale-assigned". If you are still working on the issue, please give an
update and remove the label. If you are no longer working on the issue, please
unassign so someone else may work on it. In 7 days the issue will be
automatically unassigned.
> [ZetaSQL] Support 4-byte unicode in literal string unparsing
> ------------------------------------------------------------
>
> Key: BEAM-9180
> URL: https://issues.apache.org/jira/browse/BEAM-9180
> Project: Beam
> Issue Type: Improvement
> Components: dsl-sql-zetasql
> Reporter: Kirill Kozlov
> Assignee: Robin Qiu
> Priority: P3
> Labels: stale-assigned
>
> When unprasing literal strings we need to escape special symbols (ex: `\n`,
> `\r`, `\u0012`).
> ZetaSQL supports for some 4-byte (or 8 hex digit) unicode via `\Uhhhhhhhh`.
> As of
> [now|[https://github.com/apache/beam/blob/8a35f408f640d04c38ad6e2a497d30410b3bff32/sdks/java/extensions/sql/src/main/java/org/apache/beam/sdk/extensions/sql/meta/provider/bigquery/BeamSqlUnparseContext.java#L59]]
> only 2-byte (or 4 hex digit) unicode is supported by escaping it via `\u`.
>
> More about escape sequences here (need to scroll down a little):
> https://cloud.google.com/bigquery/docs/reference/standard-sql/lexical
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