Comments inline.
> On Dec 10, 2021, at 4:34 AM, Максим Грамин <mgra...@gmail.com> wrote:
>
> 1. In FilterCalcMergeRule get rid of casting to LogicalCalc and LogicalFilter:
>
> @Override public void onMatch(RelOptRuleCall call) {
> final Filter filter = call.rel(0);
> final Calc calc = call.rel(1);
Yes.
But keep the default config to match only Filter and LogicalCalc. People who
want to match, say, all sub-classes of Calc can create their own config.
> 2. In FilterCalcMergeRule and FilterCalcMergeRule replace
> LogicalCalc.create with calc.copy:
>
> final Calc newCalc = calc.copy(calc.getTraitSet(), calc.getInput(),
> mergedProgram);
Yes. (There’s a small chance of hitting bugs if sub-classes have implemented
copy incorrectly.)
> 3. In ProjectCalcMergeRule replace the code:
>
> if (RexOver.containsOver(program)) {
> LogicalCalc projectAsCalc = LogicalCalc.create(calc, program);
> call.transformTo(projectAsCalc);
> return;
> }
>
> with a simple one:
>
> if (RexOver.containsOver(program)) {
> return;
> }
>
> because special rule ProjectToCalcRule convert LogicalProject to LogicalCalc.
I’m not convinced. Can you point me to a test in RelOptRulesTest that exercises
this code and works before and after your change?
Please log a Jira case for this proposed change and we can discuss further
there.
Julian
