[jira] [Created] (SPARK-20856) support statement using nested joins

["N Campbell (JIRA)" <ji...@apache.org>]

N Campbell created SPARK-20856:
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             Summary: support statement using nested joins
                 Key: SPARK-20856
                 URL: https://issues.apache.org/jira/browse/SPARK-20856
             Project: Spark
          Issue Type: Improvement
          Components: SQL
    Affects Versions: 2.1.0
            Reporter: N Campbell


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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