SlotRefEqualRule.java

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// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
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//
//   http://www.apache.org/licenses/LICENSE-2.0
//
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package org.apache.doris.rewrite.mvrewrite;

import org.apache.doris.analysis.CreateMaterializedViewStmt;
import org.apache.doris.analysis.Expr;
import org.apache.doris.analysis.SlotRef;
import org.apache.doris.catalog.MaterializedIndexMeta;

public class SlotRefEqualRule implements MVExprEqualRule {

    public static MVExprEqualRule INSTANCE = new SlotRefEqualRule();

    private String normalize(String name) {
        return MaterializedIndexMeta
                .normalizeName(CreateMaterializedViewStmt.mvColumnBreaker(name));
    }

    @Override
    public boolean equal(Expr queryExpr, Expr mvColumnExpr) {
        if ((!(queryExpr instanceof SlotRef)) || (!(mvColumnExpr instanceof SlotRef))) {
            return false;
        }
        SlotRef querySlotRef = (SlotRef) queryExpr;
        SlotRef mvColumnSlotRef = (SlotRef) mvColumnExpr;

        if (querySlotRef.getColumnName() != null
                && normalize(querySlotRef.getColumnName()).equalsIgnoreCase(
                    normalize(mvColumnSlotRef.getColumnName()))) {
            return true;
        }
        return false;
    }
}