CollectCteConsumerOutput.java

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//
//   http://www.apache.org/licenses/LICENSE-2.0
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package org.apache.doris.nereids.rules.rewrite;

import org.apache.doris.nereids.rules.Rule;
import org.apache.doris.nereids.rules.RuleType;
import org.apache.doris.nereids.trees.expressions.Slot;

import java.util.HashSet;
import java.util.Set;

/**
 * Collect outputs of CTE Consumer.
 */
public class CollectCteConsumerOutput extends OneRewriteRuleFactory {

    @Override
    public Rule build() {
        return logicalCTEConsumer().thenApply(ctx -> {
            Set<Slot> producerOutputs = ctx.statementContext
                    .getCteIdToOutputIds().computeIfAbsent(ctx.root.getCteId(), k -> new HashSet<>());
            producerOutputs.addAll(ctx.root.getProducerToConsumerOutputMap().keySet());
            return null;
        }).toRule(RuleType.COLLECT_CTE_CONSUMER_OUTPUT);
    }
}