[CALCITE-340] Optiq IllegalArgumentException when push complex expressions into join conditions.

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 0.9.0-incubating
• Assignee: Julian Hyde
• Reporter: Jinfeng Ni
• Created: 09/Jul/14 21:58
• Updated: 25/Aug/14 19:10
• Resolved: 10/Jul/14 20:46

Description

Optiq SqlToRelConverter will throw IllegalArgumentException, when join conditions in the on clause contains a complex expression, in stead of a single column. For example ( the query itself is not a meaningful one).

select e."deptno", d."deptno"
from "hr"."emps" as e
join "hr"."depts" as d
on ( e."deptno" + 1 - 1 = d."deptno" + 2 - 2 and
e."deptno" + 10 - 10 = d."deptno" + 20 - 20 )

Optiq is trying to create projects for complex expression on both sides of join operator, and push project past the join operator.

Join (#1 = # 4 and #2 = #5)
/ \
Proj ( deptno, deptno+1-1, deptno +10-10) Proj ( deptno, deptno+2-1, deptno +20-20)

However, in SqlRelConverter:pushDownJoinConditions(), the index for the new created expressions are not maintained properly, which lead to the IllegalArgumentException.