ExistsPredicate.java

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// to you under the Apache License, Version 2.0 (the
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//
//   http://www.apache.org/licenses/LICENSE-2.0
//
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package org.apache.doris.analysis;

import org.apache.doris.thrift.TExprNode;

import com.google.common.base.Preconditions;

/**
 * Class representing a [NOT] EXISTS predicate.
 */
public class ExistsPredicate extends Predicate {
    private boolean notExists = false;

    public boolean isNotExists() {
        return notExists;
    }

    public ExistsPredicate(Subquery subquery, boolean notExists) {
        Preconditions.checkNotNull(subquery);
        children.add(subquery);
        this.notExists = notExists;
    }

    public ExistsPredicate(ExistsPredicate other) {
        super(other);
        notExists = other.notExists;
    }

    @Override
    public Expr negate() {
        return new ExistsPredicate((Subquery) getChild(0), !notExists);
    }

    @Override
    protected void toThrift(TExprNode msg) {
        // Cannot serialize a nested predicate
        Preconditions.checkState(false);
    }

    @Override
    public Expr clone() {
        return new ExistsPredicate(this);
    }

    @Override
    public String toSqlImpl() {
        StringBuilder strBuilder = new StringBuilder();
        if (notExists) {
            strBuilder.append("NOT ");

        }
        strBuilder.append("EXISTS ");
        strBuilder.append(getChild(0).toSql());
        return strBuilder.toString();
    }

    @Override
    public String toDigestImpl() {
        StringBuilder strBuilder = new StringBuilder();
        if (notExists) {
            strBuilder.append("NOT ");

        }
        strBuilder.append("EXISTS ");
        strBuilder.append(getChild(0).toDigest());
        return strBuilder.toString();
    }

    @Override
    public int hashCode() {
        return 31 * super.hashCode() + Boolean.hashCode(notExists);
    }

    @Override
    public boolean supportSerializable() {
        return false;
    }
}