Function.java

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

import org.apache.doris.nereids.trees.expressions.Expression;
import org.apache.doris.nereids.trees.expressions.functions.scalar.Lambda;

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

/**
 * function in nereids.
 */
public abstract class Function extends Expression {
    private final String name;

    public Function(String name, Expression... children) {
        super(children);
        this.name = Objects.requireNonNull(name, "name can not be null");
    }

    public Function(String name, List<Expression> children) {
        this(name, children, false);
    }

    public Function(String name, List<Expression> children, boolean inferred) {
        super(children, inferred);
        this.name = Objects.requireNonNull(name, "name can not be null");
    }

    public boolean isHighOrder() {
        return !children.isEmpty() && children.get(0) instanceof Lambda;
    }

    public final String getName() {
        return name;
    }
}