WeeksAdd.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.scalar;

import org.apache.doris.catalog.FunctionSignature;
import org.apache.doris.common.Config;
import org.apache.doris.nereids.trees.expressions.Expression;
import org.apache.doris.nereids.trees.expressions.functions.ComputeSignatureForDateArithmetic;
import org.apache.doris.nereids.trees.expressions.functions.DateAddSubMonotonic;
import org.apache.doris.nereids.trees.expressions.functions.ExplicitlyCastableSignature;
import org.apache.doris.nereids.trees.expressions.functions.PropagateNullableOnDateOrTimeLikeV2Args;
import org.apache.doris.nereids.trees.expressions.shape.BinaryExpression;
import org.apache.doris.nereids.trees.expressions.visitor.ExpressionVisitor;
import org.apache.doris.nereids.types.DateTimeType;
import org.apache.doris.nereids.types.DateTimeV2Type;
import org.apache.doris.nereids.types.DateType;
import org.apache.doris.nereids.types.DateV2Type;
import org.apache.doris.nereids.types.IntegerType;

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

import java.util.List;

/**
 * ScalarFunction 'weeks_add'.
 */
public class WeeksAdd extends ScalarFunction
        implements BinaryExpression, ExplicitlyCastableSignature,
        ComputeSignatureForDateArithmetic, PropagateNullableOnDateOrTimeLikeV2Args, DateAddSubMonotonic {

    // When enable_date_conversion is true, we prefer to V2 signature.
    // This preference follows original planner. refer to ScalarType.getDefaultDateType()
    private static final List<FunctionSignature> SIGNATURES = Config.enable_date_conversion ? ImmutableList.of(
            FunctionSignature.ret(DateTimeV2Type.SYSTEM_DEFAULT)
                    .args(DateTimeV2Type.SYSTEM_DEFAULT, IntegerType.INSTANCE),
            FunctionSignature.ret(DateV2Type.INSTANCE).args(DateV2Type.INSTANCE, IntegerType.INSTANCE),
            FunctionSignature.ret(DateTimeType.INSTANCE).args(DateTimeType.INSTANCE, IntegerType.INSTANCE),
            FunctionSignature.ret(DateType.INSTANCE).args(DateType.INSTANCE, IntegerType.INSTANCE)
    ) : ImmutableList.of(
            FunctionSignature.ret(DateTimeType.INSTANCE).args(DateTimeType.INSTANCE, IntegerType.INSTANCE),
            FunctionSignature.ret(DateType.INSTANCE).args(DateType.INSTANCE, IntegerType.INSTANCE),
            FunctionSignature.ret(DateTimeV2Type.SYSTEM_DEFAULT)
                    .args(DateTimeV2Type.SYSTEM_DEFAULT, IntegerType.INSTANCE),
            FunctionSignature.ret(DateV2Type.INSTANCE).args(DateV2Type.INSTANCE, IntegerType.INSTANCE)
    );

    public WeeksAdd(Expression arg0, Expression arg1) {
        super("weeks_add", arg0, arg1);
    }

    @Override
    public WeeksAdd withChildren(List<Expression> children) {
        Preconditions.checkArgument(children.size() == 2);
        return new WeeksAdd(children.get(0), children.get(1));
    }

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

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

    @Override
    public Expression withConstantArgs(Expression literal) {
        return new WeeksAdd(literal, child(1));
    }
}