AddProjectForJoin.java

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package org.apache.doris.nereids.rules.rewrite;

import org.apache.doris.nereids.jobs.JobContext;
import org.apache.doris.nereids.trees.plans.Plan;
import org.apache.doris.nereids.trees.plans.logical.LogicalJoin;
import org.apache.doris.nereids.trees.plans.logical.LogicalProject;
import org.apache.doris.nereids.trees.plans.visitor.CustomRewriter;
import org.apache.doris.nereids.trees.plans.visitor.DefaultPlanRewriter;

import com.google.common.collect.ImmutableList;

/**
 * We need this rule to cast all filter and join conjunct's return type to boolean after rewrite.
 */
public class AddProjectForJoin extends DefaultPlanRewriter<Void> implements CustomRewriter {

    @Override
    public Plan rewriteRoot(Plan plan, JobContext jobContext) {
        return plan.accept(this, null);
    }

    @Override
    public Plan visitLogicalJoin(LogicalJoin<? extends Plan, ? extends Plan> join, Void context) {
        join = (LogicalJoin<? extends Plan, ? extends Plan>) super.visit(join, context);
        return new LogicalProject<>(ImmutableList.copyOf(join.getOutput()), join);
    }
}