DateCeilFloorMonotonic.java

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package org.apache.doris.nereids.trees.expressions.functions;

import org.apache.doris.nereids.trees.expressions.Expression;
import org.apache.doris.nereids.trees.expressions.literal.IntegerLikeLiteral;
import org.apache.doris.nereids.trees.expressions.literal.Literal;

/** Monotonicity and rounding relation of date/time ceil and floor functions. */
public interface DateCeilFloorMonotonic extends RoundingMonotonic {
    @Override
    default boolean isMonotonic(Literal lower, Literal upper) {
        switch (arity()) {
            case 1:
                return true;
            case 2:
                return !(child(0) instanceof Literal) && child(1) instanceof Literal;
            case 3:
                return !(child(0) instanceof Literal) && child(1) instanceof Literal && child(2) instanceof Literal;
            default:
                return false;
        }
    }

    @Override
    default boolean isPositive() {
        return true;
    }

    @Override
    default int getMonotonicFunctionChildIndex() {
        return 0;
    }

    @Override
    default boolean isRoundingRelationGuaranteed() {
        if (arity() == 1) {
            return true;
        }
        if (arity() == 2 && getArgument(1).getDataType().isDateLikeType()) {
            return true;
        }
        return (arity() == 2 || arity() == 3) && isPositiveIntegerLiteral(getArgument(1));
    }

    private boolean isPositiveIntegerLiteral(Expression expression) {
        return expression instanceof IntegerLikeLiteral
                && ((IntegerLikeLiteral) expression).getBigDecimalValue().signum() > 0;
    }
}