IvmAggBitmapUnionCountProcessor.java

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

import org.apache.doris.nereids.trees.expressions.Expression;
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.BitmapUnionCount;
import org.apache.doris.nereids.trees.expressions.functions.scalar.BitmapCount;

import com.google.common.collect.ImmutableList;

import java.util.List;

/** Processor for BITMAP_UNION_COUNT(expr). */
class IvmAggBitmapUnionCountProcessor extends IvmAggBitmapProcessor {
    @Override
    public boolean supportsOriginalFunction(AggregateFunction function) {
        return function instanceof BitmapUnionCount;
    }

    @Override
    public IvmAggFunctionKind handledFunctionKind() {
        return IvmAggFunctionKind.BITMAP_UNION_COUNT;
    }

    @Override
    protected List<IvmAggStateKey> hiddenStateKeys(AggregateFunction function) {
        return ImmutableList.of(IvmAggStateKey.BITMAP_UNION);
    }

    @Override
    public void appendApplyExpressions(IvmAggTarget target, IvmAggApplyContext applyContext) {
        IvmAggExpressionBuilder ctx = applyContext.expressions();
        // Keep the bitmap union as hidden MV state; the visible BITMAP_UNION_COUNT value is bitmap_count(state).
        Slot oldBitmap = applyContext.rawMvSlot(target.getHiddenStateSlot(IvmAggStateKey.BITMAP_UNION).getName());
        Expression newBitmap = buildGuardedNewBitmap(target, applyContext, oldBitmap);
        applyContext.putFinalExpression(target.getHiddenStateSlot(IvmAggStateKey.BITMAP_UNION).getName(), newBitmap);
        applyContext.putFinalExpression(target.getVisibleSlot().getName(),
                ctx.castIfNeeded(new BitmapCount(newBitmap), target.getVisibleSlot().getDataType()));
    }
}