ArrayLast.java

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

import org.apache.doris.catalog.FunctionSignature;
import org.apache.doris.nereids.trees.expressions.Expression;
import org.apache.doris.nereids.trees.expressions.literal.BigIntLiteral;

import java.util.List;

/**
 * ScalarFunction 'array_last'.
 */
public class ArrayLast extends ElementAt
        implements HighOrderFunction {

    /**
     * constructor with arguments.
     * array_last(lambda, a1, ...) = element_at(array_filter(lambda, a1, ...), -1)
     */
    public ArrayLast(Expression arg) {
        super(new ArrayFilter(arg), new BigIntLiteral(-1));
    }

    @Override
    public List<FunctionSignature> getImplSignature() {
        return SIGNATURES;
    }
}