ArrayLastIndex.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.functions.AlwaysNotNullable;
import org.apache.doris.nereids.trees.expressions.visitor.ExpressionVisitor;
import org.apache.doris.nereids.types.ArrayType;
import org.apache.doris.nereids.types.BigIntType;
import org.apache.doris.nereids.types.BooleanType;

import com.google.common.collect.ImmutableList;

import java.util.List;

/**
 * ScalarFunction 'array_last_index'.
 */
public class ArrayLastIndex extends ScalarFunction
        implements HighOrderFunction, AlwaysNotNullable {

    public static final List<FunctionSignature> SIGNATURES = ImmutableList.of(
            FunctionSignature.ret(BigIntType.INSTANCE).args(ArrayType.of(BooleanType.INSTANCE))
    );

    private ArrayLastIndex(List<Expression> expressions) {
        super("array_last_index", expressions);
    }

    /**
     * constructor with arguments.
     * array_last_index(lambda, a1, ...) = array_last_index(array_map(lambda, a1, ...))
     */
    public ArrayLastIndex(Expression arg) {
        super("array_last_index", arg instanceof Lambda ? new ArrayMap(arg) : arg);
    }

    /**
     * withChildren.
     */
    @Override
    public ArrayLastIndex withChildren(List<Expression> children) {
        return new ArrayLastIndex(children);
    }

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

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