[jira] [Created] (CALCITE-1977) Use Cosette to check whether planner rules are valid

["Julian Hyde (JIRA)" <ji...@apache.org>]

Julian Hyde created CALCITE-1977:
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             Summary: Use Cosette to check whether planner rules are valid
                 Key: CALCITE-1977
                 URL: https://issues.apache.org/jira/browse/CALCITE-1977
             Project: Calcite
          Issue Type: Bug
            Reporter: Julian Hyde
            Assignee: Julian Hyde


Use [Cosette|http://cosette.cs.washington.edu/], an automated SQL solver from University of Washington, to check whether planner rules are valid.

I don't know whether Cosette is written in Java, so the simplest approach might be to instrument the planner to generate a script. Suppose {{FilterProjectTransposeRule}} has just fired successfully. Then {{RelOptRuleCall#transformTo}} would generate the line

{code}
  assertEquivalent(
    "select * from (select empno from emp) where empno > 10",
    "select empno from (select * from emp where empno > 10)")
{code}

(Those SQL statements are the result of converting the before and after {{RelNode}} instances to SQL.)

We could run the Calcite test suite to produce a large script with probably thousands of those statements. Then the Cosette researchers can take that script and run it through Cosette (using whatever language they develop in). It would find bugs in Cosette (at first mostly deficiencies in Cosette's SQL parser, I fear) but also would find bugs in Calcite if the transformation is not valid. (Not too many, I hope!)



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