MultiDistinctSum0.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.ComputePrecisionForSum;
import org.apache.doris.nereids.trees.expressions.functions.ExplicitlyCastableSignature;
import org.apache.doris.nereids.trees.expressions.literal.BigIntLiteral;
import org.apache.doris.nereids.trees.expressions.literal.DecimalV3Literal;
import org.apache.doris.nereids.trees.expressions.literal.DoubleLiteral;
import org.apache.doris.nereids.trees.expressions.literal.LargeIntLiteral;
import org.apache.doris.nereids.trees.expressions.shape.UnaryExpression;
import org.apache.doris.nereids.trees.expressions.visitor.ExpressionVisitor;
import org.apache.doris.nereids.types.DataType;
import org.apache.doris.nereids.types.DecimalV3Type;

import com.google.common.base.Preconditions;

import java.math.BigDecimal;
import java.math.BigInteger;
import java.util.List;

/** MultiDistinctSum0 */
public class MultiDistinctSum0 extends NotNullableAggregateFunction implements UnaryExpression,
        ExplicitlyCastableSignature, ComputePrecisionForSum, MultiDistinction {

    private final boolean mustUseMultiDistinctAgg;

    public MultiDistinctSum0(Expression arg0) {
        this(false, arg0);
    }

    public MultiDistinctSum0(boolean distinct, Expression arg0) {
        this(false, false, arg0);
    }

    private MultiDistinctSum0(boolean mustUseMultiDistinctAgg, boolean distinct, Expression arg0) {
        super("multi_distinct_sum0", false, arg0);
        this.mustUseMultiDistinctAgg = mustUseMultiDistinctAgg;
    }

    @Override
    public void checkLegalityBeforeTypeCoercion() {
        DataType argType = child().getDataType();
        if ((!argType.isNumericType() && !argType.isBooleanType() && !argType.isNullType())
                || argType.isOnlyMetricType()) {
            throw new AnalysisException("sum0 requires a numeric or boolean parameter: " + this.toSql());
        }
    }

    @Override
    public List<FunctionSignature> getSignatures() {
        return new Sum0(getArgument(0)).getSignatures();
    }

    @Override
    public FunctionSignature searchSignature(List<FunctionSignature> signatures) {
        return new Sum0(getArgument(0)).searchSignature(signatures);
    }

    @Override
    public MultiDistinctSum0 withDistinctAndChildren(boolean distinct, List<Expression> children) {
        Preconditions.checkArgument(children.size() == 1);
        return new MultiDistinctSum0(mustUseMultiDistinctAgg, distinct, children.get(0));
    }

    @Override
    public <R, C> R accept(ExpressionVisitor<R, C> visitor, C context) {
        return visitor.visitMultiDistinctSum0(this, context);
    }

    @Override
    public boolean mustUseMultiDistinctAgg() {
        return mustUseMultiDistinctAgg;
    }

    @Override
    public Expression withMustUseMultiDistinctAgg(boolean mustUseMultiDistinctAgg) {
        return new MultiDistinctSum0(mustUseMultiDistinctAgg, false, children.get(0));
    }

    @Override
    public Expression resultForEmptyInput() {
        DataType dataType = getDataType();
        if (dataType.isBigIntType()) {
            return new BigIntLiteral(0);
        } else if (dataType.isLargeIntType()) {
            return new LargeIntLiteral(new BigInteger("0"));
        } else if (dataType.isDecimalV3Type()) {
            return new DecimalV3Literal((DecimalV3Type) dataType, new BigDecimal("0"));
        } else if (dataType.isDoubleType()) {
            return new DoubleLiteral(0);
        } else {
            return new DoubleLiteral(0);
        }
    }
}