MVColumnHLLUnionPattern.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.analysis;

import org.apache.doris.catalog.FunctionSet;
import org.apache.doris.catalog.PrimitiveType;
import org.apache.doris.catalog.Type;

public class MVColumnHLLUnionPattern implements MVColumnPattern {
    @Override
    public boolean match(Expr expr) {
        if (!(expr instanceof FunctionCallExpr)) {
            return false;
        }
        FunctionCallExpr fnExpr = (FunctionCallExpr) expr;
        if (fnExpr.isDistinct()) {
            return false;
        }
        String fnNameString = fnExpr.getFnName().getFunction();
        if (!fnNameString.equalsIgnoreCase(FunctionSet.HLL_UNION)) {
            return false;
        }
        if (fnExpr.getChild(0) instanceof SlotRef) {
            SlotRef slotRef = (SlotRef) fnExpr.getChild(0);
            if (slotRef.getType().getPrimitiveType() == PrimitiveType.HLL && slotRef.getColumn() != null) {
                return true;
            } else {
                return false;
            }
        } else if (fnExpr.getChild(0) instanceof FunctionCallExpr) {
            FunctionCallExpr child0FnExpr = (FunctionCallExpr) fnExpr.getChild(0);
            if (!child0FnExpr.getType().equals(Type.HLL)) {
                return false;
            }
            SlotRef slotRef = child0FnExpr.getChild(0).unwrapSlotRef();
            if (slotRef == null) {
                return false;
            } else if (slotRef.getType() == Type.DECIMALV2 || slotRef.getType().isDecimalV3()) {
                return false;
            }
            return true;
        } else {
            return false;
        }
    }

    @Override
    public String toString() {
        return FunctionSet.HLL_UNION + "(" + FunctionSet.HLL_HASH + "(column)) column could not be decimal. "
                + "Or " + FunctionSet.HLL_UNION + "(hll_column) in agg table";
    }
}