IvmAggMaxProcessor.java

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package org.apache.doris.mtmv.ivm.agg;

import org.apache.doris.mtmv.ivm.IvmFailureClassifier;
import org.apache.doris.nereids.trees.expressions.Expression;
import org.apache.doris.nereids.trees.expressions.GreaterThan;
import org.apache.doris.nereids.trees.expressions.LessThan;
import org.apache.doris.nereids.trees.expressions.LessThanEqual;
import org.apache.doris.nereids.trees.expressions.Slot;
import org.apache.doris.nereids.trees.expressions.functions.agg.AggregateFunction;
import org.apache.doris.nereids.trees.expressions.functions.agg.CountAtMax;
import org.apache.doris.nereids.trees.expressions.functions.agg.Max;

/** MAX-specific extreme comparisons and delta state. */
class IvmAggMaxProcessor extends IvmAggExtremalProcessor {
    IvmAggMaxProcessor() {
        super(IvmAggFunctionKind.MAX, IvmAggStateKey.MAX_COUNT, "DELMAX");
    }

    @Override
    public boolean supportsOriginalFunction(AggregateFunction function) {
        return function instanceof Max;
    }

    @Override
    protected Expression buildExtremeAggregate(Expression input) {
        return new Max(input);
    }

    @Override
    protected Expression buildExtremeCountAggregate(Expression input) {
        return new CountAtMax(input);
    }

    @Override
    protected Expression insertedIsBetter(Expression deltaInsert, Slot oldExtreme) {
        return new GreaterThan(deltaInsert, oldExtreme);
    }

    @Override
    protected Expression deletedExtremeIsAtLeastOld(Expression deltaDelete, Slot oldExtreme) {
        return new LessThanEqual(deltaDelete, oldExtreme);
    }

    @Override
    protected Expression deletedExtremeIsBeyondInsert(Expression deltaDelete, Expression deltaInsert) {
        return new LessThan(deltaDelete, deltaInsert);
    }

    @Override
    protected String fallbackMessage() {
        return IvmFailureClassifier.MIN_MAX_BOUNDARY_MSG_PREFIX
                + ": deleted row may be current MAX value";
    }
}