ComparisonPredicate.java

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

import org.apache.doris.nereids.exceptions.AnalysisException;
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 org.apache.doris.nereids.types.coercion.AnyDataType;

import java.util.List;

/**
 * Comparison predicate expression.
 * Such as: "=", "<", "<=", ">", ">=", "<=>"
 */
public abstract class ComparisonPredicate extends BinaryOperator {

    public ComparisonPredicate(List<Expression> children, String symbol) {
        this(children, symbol, false);
    }

    public ComparisonPredicate(List<Expression> children, String symbol, boolean inferred) {
        super(children, symbol, inferred);
    }

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

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

    @Override
    public DataType inputType() {
        return AnyDataType.INSTANCE_WITHOUT_INDEX;
    }

    /**
     * Commute between left and right children.
     */
    public abstract ComparisonPredicate commute();

    @Override
    public void checkLegalityBeforeTypeCoercion() {
        for (Expression c : children) {
            if (c.getDataType().isComplexType() && !c.getDataType().isArrayType()) {
                throw new AnalysisException("comparison predicate could not contains complex type: " + this.toSql());
            } else if (c.getDataType().isJsonType()) {
                throw new AnalysisException("comparison predicate could not contains json type: " + this.toSql());
            }
        }
    }
}