Hello Pranav,
here some untested pseudo-code that could give you an idea how to achieve
this. It probably needs several adaptations to make it work (marked with
"<- here", possibly others).
private static final Method BIND = Types.lookupMethod(Bindable.class,
> "bind", Bindable.class, DataContext.class); // <- here
>
> private static class EnumerableBindableRel extends AbstractRelNode
> implements EnumerableRel {
> private final BindableRel bindable;
>
> public EnumerableBindableRel(BindableRel bindable) {
> super(bindable.getCluster(), bindable.getTraitSet());
> this.bindable = bindable;
> }
>
> @Override
> public Result implement(EnumerableRelImplementor implementor, Prefer
> pref) {
> final PhysType physType = PhysTypeImpl.of(
> implementor.getTypeFactory(),
> this.getRowType(),
> JavaRowFormat.ARRAY); // <- here
>
> final BlockBuilder builder = new BlockBuilder();
> MethodCallExpression call = Expressions.call( // <- here, correct
> arguments?
> implementor.stash(this.bindable, Bindable.class),
> BIND,
> implementor.getRootExpression());
>
> ParameterExpression resultVar =
> Expressions.parameter(Enumerable.class, "_result");
> builder.add(Expressions.declare(Modifier.FINAL, resultVar, call));
> builder.add(Expressions.return_(null, resultVar));
> return implementor.result(physType, builder.toBlock());
> }
> }
>
> private static EnumerableRel getEnumerableRel(BindableRel bindable) {
> return new EnumerableBindableRel(bindable);
> }
>
Cordialement / Best Regards,
Dr. Thomas Rebele | R&D Developer | Germany | E treb...@tibco.com | W
www.tibco.com
TIBCO Software GmbH | St.-Martin-Str. 106, 81669 München, Deutschland |
Registergericht: Amtsgericht München, HRB 123355 | Geschäftsführer: William
Hughes; Alexander E. Kolar
Cordialement / Best Regards,
*Dr. Thomas Rebele* | R&D Developer | Germany | *E* *treb...@tibco.com
<treb...@tibco.com>* | *W* *www.tibco.com <http://www.tibco.com/>*
*TIBCO Software GmbH* | St.-Martin-Str. 106, 81669 München, Deutschland |
Registergericht: Amtsgericht München, HRB 123355 | Geschäftsführer: William
Hughes; Alexander E. Kolar
On Fri, Sep 23, 2022 at 10:50 PM Pranav Deshpande <
deshpande.v.pra...@gmail.com> wrote:
> Dear Apache Calcite Team,
> Is there a way to convert a BindableRel into an EnumerableRel?
>
> There is a rule to convert an EnumerableRel into a BindableRel, but not the
> other way around.
>
> I am asking this because I wish to have my TableScans use the
> BindableConvention and the rest of my execution using the Enumerable
> Convention [as it has more operators!].
>
> Regards,
> Pranav
>
