maropu commented on a change in pull request #23531: [SPARK-24497][SQL] Support
recursive SQL query
URL: https://github.com/apache/spark/pull/23531#discussion_r307091967
##########
File path: sql/core/src/test/resources/sql-tests/results/cte.sql.out
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@@ -328,16 +328,891 @@ struct<scalarsubquery():int>
-- !query 25
-DROP VIEW IF EXISTS t
+WITH r(level) AS (
+ VALUES (0)
+ UNION ALL
+ SELECT level + 1 FROM r WHERE level < 10
+)
+SELECT * FROM r
-- !query 25 schema
struct<>
-- !query 25 output
-
+org.apache.spark.sql.AnalysisException
+Table or view not found: r; line 4 pos 24
Review comment:
Can you make the error message more clear as pg does so?
```
postgres=# WITH r(level) AS (
postgres(# VALUES (0)
postgres(# UNION ALL
postgres(# SELECT level + 1 FROM r WHERE level < 10
postgres(# )
postgres-# SELECT * FROM r;
ERROR: relation "r" does not exist
LINE 4: SELECT level + 1 FROM r WHERE level < 10
^
DETAIL: There is a WITH item named "r", but it cannot be referenced from
this part of the query.
HINT: Use WITH RECURSIVE, or re-order the WITH items to remove forward
references.
```
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