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https://issues.apache.org/jira/browse/SPARK-20856?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16853575#comment-16853575
]
Yuming Wang commented on SPARK-20856:
-------------------------------------
PostgreSQL 11.3 also support this join case:
{code:sql}
CREATE TABLE J1_TBL (
i integer,
j integer,
t text
);
CREATE TABLE J2_TBL (
i integer,
k integer
);
CREATE TABLE J3_TBL (
i integer,
k integer
);
INSERT INTO J1_TBL VALUES (1, 4, 'one');
INSERT INTO J2_TBL VALUES (1, -1);
INSERT INTO J3_TBL VALUES (1, -1);
select * from J1_TBL t1 join J2_TBL t2 join J3_TBL t3 on t3.i = t2.i on t2.i =
t1.i;
{code}
> support statement using nested joins
> ------------------------------------
>
> Key: SPARK-20856
> URL: https://issues.apache.org/jira/browse/SPARK-20856
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Affects Versions: 2.1.0
> Reporter: N Campbell
> Priority: Major
> Labels: bulk-closed
>
> While DB2, ORACLE etc support a join expressed as follows, SPARK SQL does
> not.
> Not supported
> select * from
> cert.tsint tsint inner join cert.tint tint inner join cert.tbint tbint
> on tbint.rnum = tint.rnum
> on tint.rnum = tsint.rnum
> versus written as shown
> select * from
> cert.tsint tsint inner join cert.tint tint on tsint.rnum = tint.rnum inner
> join cert.tbint tbint on tint.rnum = tbint.rnum
>
> ERROR_STATE, SQL state: org.apache.spark.sql.catalyst.parser.ParseException:
> extraneous input 'on' expecting {<EOF>, ',', '.', '[', 'WHERE', 'GROUP',
> 'ORDER', 'HAVING', 'LIMIT', 'OR', 'AND', 'IN', NOT, 'BETWEEN', 'LIKE', RLIKE,
> 'IS', 'JOIN', 'CROSS', 'INNER', 'LEFT', 'RIGHT', 'FULL', 'NATURAL',
> 'LATERAL', 'WINDOW', 'UNION', 'EXCEPT', 'MINUS', 'INTERSECT', EQ, '<=>',
> '<>', '!=', '<', LTE, '>', GTE, '+', '-', '*', '/', '%', 'DIV', '&', '|',
> '^', 'SORT', 'CLUSTER', 'DISTRIBUTE', 'ANTI'}(line 4, pos 5)
> == SQL ==
> select * from
> cert.tsint tsint inner join cert.tint tint inner join cert.tbint tbint
> on tbint.rnum = tint.rnum
> on tint.rnum = tsint.rnum
> -----^^^
> , Query: select * from
> cert.tsint tsint inner join cert.tint tint inner join cert.tbint tbint
> on tbint.rnum = tint.rnum
> on tint.rnum = tsint.rnum.
> SQLState: HY000
> ErrorCode: 500051
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