TopNArray.java

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// to you under the Apache License, Version 2.0 (the
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//   http://www.apache.org/licenses/LICENSE-2.0
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package org.apache.doris.nereids.trees.expressions.functions.agg;

import org.apache.doris.catalog.FunctionSignature;
import org.apache.doris.nereids.trees.expressions.Expression;
import org.apache.doris.nereids.trees.expressions.functions.ExplicitlyCastableSignature;
import org.apache.doris.nereids.trees.expressions.visitor.ExpressionVisitor;
import org.apache.doris.nereids.types.ArrayType;
import org.apache.doris.nereids.types.IntegerType;
import org.apache.doris.nereids.types.coercion.AnyDataType;
import org.apache.doris.nereids.types.coercion.FollowToAnyDataType;

import com.google.common.base.Preconditions;
import com.google.common.collect.ImmutableList;

import java.util.List;

/**
 * AggregateFunction 'topn_array'. This class is generated by GenerateFunction.
 */
public class TopNArray extends NullableAggregateFunction
        implements ExplicitlyCastableSignature {

    public static final List<FunctionSignature> SIGNATURES = ImmutableList.of(
            FunctionSignature.ret(ArrayType.of(new FollowToAnyDataType(0)))
                    .args(new AnyDataType(0), IntegerType.INSTANCE),
            FunctionSignature.ret(ArrayType.of(new FollowToAnyDataType(0)))
                    .args(new AnyDataType(0), IntegerType.INSTANCE, IntegerType.INSTANCE)
    );

    /**
     * constructor with 2 arguments.
     */
    public TopNArray(Expression arg0, Expression arg1) {
        this(false, arg0, arg1);
    }

    /**
     * constructor with 2 arguments.
     */
    public TopNArray(boolean distinct, Expression arg0, Expression arg1) {
        this(distinct, false, arg0, arg1);
    }

    public TopNArray(boolean distinct, boolean alwaysNullable, Expression arg0, Expression arg1) {
        super("topn_array", distinct, alwaysNullable, arg0, arg1);
    }

    /**
     * constructor with 3 arguments.
     */
    public TopNArray(Expression arg0, Expression arg1, Expression arg2) {
        this(false, arg0, arg1, arg2);
    }

    /**
     * constructor with 3 arguments.
     */
    public TopNArray(boolean distinct, Expression arg0, Expression arg1, Expression arg2) {
        this(distinct, false, arg0, arg1, arg2);
    }

    public TopNArray(boolean distinct, boolean alwaysNullable, Expression arg0, Expression arg1, Expression arg2) {
        super("topn_array", distinct, alwaysNullable, arg0, arg1, arg2);
    }

    /**
     * withDistinctAndChildren.
     */
    @Override
    public TopNArray withDistinctAndChildren(boolean distinct, List<Expression> children) {
        Preconditions.checkArgument(children.size() == 2
                || children.size() == 3);
        if (children.size() == 2) {
            return new TopNArray(distinct, alwaysNullable, children.get(0), children.get(1));
        } else {
            return new TopNArray(distinct, alwaysNullable, children.get(0), children.get(1), children.get(2));
        }
    }

    @Override
    public NullableAggregateFunction withAlwaysNullable(boolean alwaysNullable) {
        if (children.size() == 2) {
            return new TopNArray(distinct, alwaysNullable, children.get(0), children.get(1));
        } else {
            return new TopNArray(distinct, alwaysNullable, children.get(0), children.get(1), children.get(2));
        }
    }

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

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