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[feature](Nereids): Convert topn(x, 1) to max(x) (#26004)

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jakevin
2023-10-27 18:45:21 +08:00
committed by GitHub
parent 3beba1764c
commit d953e5c8f4
5 changed files with 155 additions and 1 deletions
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fe/fe-core/src/test/java/org/apache/doris/nereids/rules/expression/rules/TopnToMaxTest.java Normal file
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// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements. See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership. The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License. You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
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// KIND, either express or implied. See the License for the
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// under the License.
package org.apache.doris.nereids.rules.expression.rules;
import org.apache.doris.nereids.rules.expression.ExpressionRewriteTestHelper;
import org.apache.doris.nereids.rules.expression.ExpressionRuleExecutor;
import org.apache.doris.nereids.trees.expressions.Slot;
import org.apache.doris.nereids.trees.expressions.SlotReference;
import org.apache.doris.nereids.trees.expressions.functions.agg.Max;
import org.apache.doris.nereids.trees.expressions.functions.agg.TopN;
import org.apache.doris.nereids.trees.expressions.literal.Literal;
import org.apache.doris.nereids.types.StringType;
import com.google.common.collect.ImmutableList;
import org.junit.jupiter.api.Test;
class TopnToMaxTest extends ExpressionRewriteTestHelper {
@Test
void testSimplifyComparisonPredicateRule() {
executor = new ExpressionRuleExecutor(ImmutableList.of(TopnToMax.INSTANCE));
Slot slot = new SlotReference("a", StringType.INSTANCE);
assertRewrite(new TopN(slot, Literal.of(1)), new Max(slot));
}
}