[SPARK-20856] support statement using nested joins

• Type: Sub-task
• Status: Reopened
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 3.1.0
• Component/s: SQL
• Assignee: Unassigned
• Reporter: N Campbell
• Created: 23/May/17 12:00
• Updated: 29/Mar/20 02:30

Description

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

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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