PropagateFuncDeps.java

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package org.apache.doris.nereids.trees.plans;

import org.apache.doris.nereids.properties.DataTrait;

/**
 * Propagate fd, keep children's fd
 */
public interface PropagateFuncDeps extends Plan {
    @Override
    default DataTrait computeDataTrait() {
        if (children().size() == 1) {
            // Note when changing function dependencies, we always clone it.
            // So it's safe to return a reference
            return child(0).getLogicalProperties().getTrait();
        }
        DataTrait.Builder builder = new DataTrait.Builder();
        children().stream()
                .map(p -> p.getLogicalProperties().getTrait())
                .forEach(builder::addDataTrait);
        return builder.build();
    }

    @Override
    default void computeUnique(DataTrait.Builder builder) {
        builder.addUniqueSlot(child(0).getLogicalProperties().getTrait());
    }

    @Override
    default void computeUniform(DataTrait.Builder builder) {
        builder.addUniformSlot(child(0).getLogicalProperties().getTrait());
    }

    @Override
    default void computeEqualSet(DataTrait.Builder builder) {
        builder.addEqualSet(child(0).getLogicalProperties().getTrait());
    }

    @Override
    default void computeFd(DataTrait.Builder builder) {
        builder.addFuncDepsDG(child(0).getLogicalProperties().getTrait());
    }
}