CompoundPredicate.java

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

import org.apache.doris.nereids.exceptions.UnboundException;
import org.apache.doris.nereids.trees.expressions.visitor.ExpressionVisitor;
import org.apache.doris.nereids.types.BooleanType;
import org.apache.doris.nereids.types.DataType;

import java.util.List;

/**
 * Compound predicate expression.
 * Such as &&,||,AND,OR.
 */
public abstract class CompoundPredicate extends BinaryOperator {

    public CompoundPredicate(List<Expression> children, String symbol) {
        super(children, symbol);
    }

    @Override
    public boolean nullable() throws UnboundException {
        return left().nullable() || right().nullable();
    }

    @Override
    public DataType getDataType() throws UnboundException {
        return BooleanType.INSTANCE;
    }

    @Override
    public <R, C> R accept(ExpressionVisitor<R, C> visitor, C context) {
        return visitor.visitCompoundPredicate(this, context);
    }

    @Override
    public DataType inputType() {
        return BooleanType.INSTANCE;
    }

    /**
     * Flip logical `and` and `or` operator with original children.
     */
    public abstract CompoundPredicate flip();

    /**
     * Flip logical `and` and `or` operator with new children.
     */
    public abstract CompoundPredicate flip(Expression left, Expression right);

    public abstract Class<? extends CompoundPredicate> flipType();

}