[
https://issues.apache.org/jira/browse/SPARK-28379?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Yuming Wang updated SPARK-28379:
--------------------------------
Comment: was deleted
(was: The lateral versus parent references case:
{code:sql}
create or replace temporary view INT8_TBL as select * from
(values (123, 456),
(123, 4567890123456789),
(4567890123456789, 123),
(4567890123456789, 4567890123456789),
(4567890123456789, -4567890123456789))
as v(q1, q2);
select *, (select r from (select q1 as q2) x, (select q2 as r) y) from int8_tbl;
{code}
Spark SQL:
{noformat}
select *, (select r from (select q1 as q2) x, (select q2 as r) y) from int8_tbl
-- !query 235 schema
struct<>
-- !query 235 output
org.apache.spark.sql.AnalysisException
Expressions referencing the outer query are not supported outside of
WHERE/HAVING clauses:
Project [outer(q1#xL) AS q2#xL]
+- OneRowRelation
;
{noformat}
PostgreSQL:
{noformat}
postgres=# select *, (select r from (select q1 as q2) x, (select q2 as r) y)
from int8_tbl;
q1 | q2 | r
------------------+-------------------+-------------------
123 | 456 | 456
123 | 4567890123456789 | 4567890123456789
4567890123456789 | 123 | 123
4567890123456789 | 4567890123456789 | 4567890123456789
4567890123456789 | -4567890123456789 | -4567890123456789
(5 rows)
{noformat}
)
> Correlated scalar subqueries must be aggregated
> -----------------------------------------------
>
> Key: SPARK-28379
> URL: https://issues.apache.org/jira/browse/SPARK-28379
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Affects Versions: 3.0.0
> Reporter: Yuming Wang
> Priority: Major
>
> Subqueries appearing in {{FROM}} can be preceded by the key word {{LATERAL}}.
> This allows them to reference columns provided by preceding {{FROM}} items.
> (Without {{LATERAL}}, each subquery is evaluated independently and so cannot
> cross-reference any other {{FROM}} item.)
> Table functions appearing in {{FROM}} can also be preceded by the key word
> {{LATERAL}}, but for functions the key word is optional; the function's
> arguments can contain references to columns provided by preceding {{FROM}}
> items in any case.
> A {{LATERAL}} item can appear at top level in the {{FROM}} list, or within a
> {{JOIN}} tree. In the latter case it can also refer to any items that are on
> the left-hand side of a {{JOIN}} that it is on the right-hand side of.
> When a {{FROM}} item contains {{LATERAL}} cross-references, evaluation
> proceeds as follows: for each row of the {{FROM}} item providing the
> cross-referenced column(s), or set of rows of multiple {{FROM}} items
> providing the columns, the {{LATERAL}} item is evaluated using that row or
> row set's values of the columns. The resulting row(s) are joined as usual
> with the rows they were computed from. This is repeated for each row or set
> of rows from the column source table(s).
> A trivial example of {{LATERAL}} is
> {code:sql}
> SELECT * FROM foo, LATERAL (SELECT * FROM bar WHERE bar.id = foo.bar_id) ss;
> {code}
> *Feature ID*: T491
> https://www.postgresql.org/docs/11/queries-table-expressions.html#QUERIES-FROM
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