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The plugin that powers ESQL for Elasticsearch

There is a newer version: 8.16.1

/*
 * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
 * or more contributor license agreements. Licensed under the Elastic License
 * 2.0; you may not use this file except in compliance with the Elastic License
 * 2.0.
 */

package org.elasticsearch.xpack.esql.plan.physical;

import org.elasticsearch.xpack.esql.core.expression.Alias;
import org.elasticsearch.xpack.esql.core.expression.Attribute;
import org.elasticsearch.xpack.esql.core.tree.NodeInfo;
import org.elasticsearch.xpack.esql.core.tree.Source;

import java.util.List;
import java.util.Objects;

import static org.elasticsearch.xpack.esql.expression.NamedExpressions.mergeOutputAttributes;

public class EvalExec extends UnaryExec implements EstimatesRowSize {
    private final List fields;

    public EvalExec(Source source, PhysicalPlan child, List fields) {
        super(source, child);
        this.fields = fields;
    }

    public List fields() {
        return fields;
    }

    @Override
    public List output() {
        return mergeOutputAttributes(fields, child().output());
    }

    @Override
    public UnaryExec replaceChild(PhysicalPlan newChild) {
        return new EvalExec(source(), newChild, fields);
    }

    @Override
    protected NodeInfo info() {
        return NodeInfo.create(this, EvalExec::new, child(), fields);
    }

    @Override
    public PhysicalPlan estimateRowSize(State state) {
        state.add(false, fields);
        return this;
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) {
            return true;
        }
        if (o == null || getClass() != o.getClass()) {
            return false;
        }
        EvalExec eval = (EvalExec) o;
        return child().equals(eval.child()) && Objects.equals(fields, eval.fields);
    }

    @Override
    public int hashCode() {
        return Objects.hash(super.hashCode(), fields);
    }
}