PercentileApprox.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.exceptions.AnalysisException;
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.DoubleType;

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

import java.util.List;

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

    public static final List<FunctionSignature> SIGNATURES = ImmutableList.of(
            FunctionSignature.ret(DoubleType.INSTANCE).args(DoubleType.INSTANCE, DoubleType.INSTANCE),
            FunctionSignature.ret(DoubleType.INSTANCE)
                    .args(DoubleType.INSTANCE, DoubleType.INSTANCE, DoubleType.INSTANCE)
    );

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

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

    public PercentileApprox(boolean distinct, boolean alwaysNullable, Expression arg0, Expression arg1) {
        super("percentile_approx", distinct, alwaysNullable, arg0, arg1);
    }

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

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

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

    @Override
    public void checkLegalityBeforeTypeCoercion() {
        if (!getArgument(1).isConstant()) {
            throw new AnalysisException(
                    "percentile_approx requires second parameter must be a constant : " + this.toSql());
        }
        if (arity() == 3) {
            if (!getArgument(2).isConstant()) {
                throw new AnalysisException(
                        "percentile_approx requires the third parameter must be a constant : " + this.toSql());
            }
        }
    }

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

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

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