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https://issues.apache.org/jira/browse/CALCITE-4033?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17120374#comment-17120374
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Rui Wang commented on CALCITE-4033:
-----------------------------------
Calcite parser recognizes only UNNEST with extra parenthesis. So it seems to
be a problem when there is LATERAL.
> SqlNode.toSqlString generates wrong query for syntax "literal(select * from
> unnest(...))"
> -----------------------------------------------------------------------------------------
>
> Key: CALCITE-4033
> URL: https://issues.apache.org/jira/browse/CALCITE-4033
> Project: Calcite
> Issue Type: Bug
> Reporter: Rui Wang
> Priority: Major
>
> Reported from: https://issues.apache.org/jira/browse/DRILL-7722
> If use this query
> {code:sql}
> SELECT
> item.name,
> relations.*
> FROM dfs.tmp item
> JOIN LATERAL(
> SELECT * FROM UNNEST(item.related) i(rels)
> ) relations
> ON TRUE
> {code}
> Then SqlNode.toSqlString() generates
> {code:sql}
> SELECT `ITEM`.`NAME`, `RELATIONS`.*
> FROM `DFS`.`TMP` AS `ITEM`
> INNER JOIN LATERAL (SELECT *
> FROM (UNNEST(`ITEM`.`RELATED`)) AS `I` (`RELS`)) AS `RELATIONS` ON TRUE");
> {code}
> Note that there are extra parentheses around the UNNEST, and make the
> generated query unparsable.
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