public RelNode convert(
RelOptPlanner planner,
RelNode rel,
RelDistribution toDistribution,
boolean allowInfiniteCostConverters) {
if (toDistribution == RelDistributions.ANY) {
return rel;
}
// Create a logical sort, then ask the planner to convert its remaining
// traits (e.g. convert it to an EnumerableSortRel if rel is enumerable
// convention)
final Exchange exchange = LogicalExchange.create(rel, toDistribution);
RelNode newRel = planner.register(exchange, rel);
final RelTraitSet newTraitSet = rel.getTraitSet().replace(toDistribution);
if (!newRel.getTraitSet().equals(newTraitSet)) {
newRel = planner.changeTraits(newRel, newTraitSet);
}
return newRel;
}
