[teiid-issues] [JBoss JIRA] (TEIID-4135) Invalid query when using recursive CTE with translators that do not suport RCTE pushdown

[Andrej Šmigala (JIRA)]

Andrej Šmigala created TEIID-4135:
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             Summary: Invalid query when using recursive CTE with translators that do not suport RCTE pushdown
                 Key: TEIID-4135
                 URL: https://issues.jboss.org/browse/TEIID-4135
             Project: Teiid
          Issue Type: Bug
          Components: JDBC Connector
    Affects Versions: 8.12.x
            Reporter: Andrej Šmigala
            Assignee: Steven Hawkins


When running a recursive common table expression query against a source that does not support recursive cte pushdown, only the recursive part of the query is pushed, which fails, since it references a non-existent table (the cte).

E. g. the query 
{code:sql}
WITH tmp_cte(id, fk, lvl) AS (
    SELECT id, fk, 0 as lvl FROM SourceModel.cte_source WHERE fk IS NULL
    UNION ALL
    SELECT e.id, e.fk, lvl + 1 as lvl FROM SourceModel.cte_source AS e INNER JOIN tmp_cte AS ecte ON ecte.id = e.fk
    )
SELECT * FROM tmp_cte
{code}

against a PostreSQL source results in {noformat}Remote org.postgresql.util.PSQLException: ERROR: relation "tmp_cte" does not exist{noformat}
because this query is pushed down:
{code:sql}SELECT g_0.id, g_0.fk, g_0.lvl FROM tmp_cte AS g_0{code}



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