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[enhancement](nereids) speedup sql cache with variable (apache#37090)
1. current sql cache will miss cache in fe and process by the fashion path cause low qps, when the variable is changed: ```sql select * from tbl where dt = @dt_var -- maybe range between 10 days ``` this pr support try to hit sql cache even the variable is changed. Before this optimize: one thread qps is 300. After this optimize: one thread qps is 3000. 2. refactor and use `ComputeResultSet` interface to return resultSet if fe can process
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fe/fe-core/src/main/java/org/apache/doris/nereids/trees/plans/ComputeResultSet.java
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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 | ||
| // "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY | ||
| // KIND, either express or implied. See the License for the | ||
| // specific language governing permissions and limitations | ||
| // under the License. | ||
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| package org.apache.doris.nereids.trees.plans; | ||
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| import org.apache.doris.nereids.CascadesContext; | ||
| import org.apache.doris.nereids.SqlCacheContext; | ||
| import org.apache.doris.qe.ResultSet; | ||
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| import java.util.Optional; | ||
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| /** | ||
| * <p> | ||
| * This class is used to return result set in fe without send fragment to be. | ||
| * Some plans support this function, for example: | ||
| * <li>1. the sql `select 100` will generate a plan, PhysicalOneRowRelation, and PhysicalOneRowRelation implement this | ||
| * interface, so fe can send the only row to client immediately. | ||
| * </li> | ||
| * <li>2. the sql `select * from tbl limit 0` will generate PhysicalEmptyRelation, which means no any rows returned, | ||
| * the PhysicalEmptyRelation implement this interface. | ||
| * </li> | ||
| * </p> | ||
| * <p> | ||
| * If you want to cache the result set in fe, you can implement this interface and write this code: | ||
| * </p> | ||
| * <pre> | ||
| * StatementContext statementContext = cascadesContext.getStatementContext(); | ||
| * boolean enableSqlCache | ||
| * = CacheAnalyzer.canUseSqlCache(statementContext.getConnectContext().getSessionVariable()); | ||
| * if (sqlCacheContext.isPresent() && enableSqlCache) { | ||
| * sqlCacheContext.get().setResultSetInFe(resultSet); | ||
| * Env.getCurrentEnv().getSqlCacheManager().tryAddFeSqlCache( | ||
| * statementContext.getConnectContext(), | ||
| * statementContext.getOriginStatement().originStmt | ||
| * ); | ||
| * } | ||
| * </pre> | ||
| */ | ||
| public interface ComputeResultSet { | ||
| Optional<ResultSet> computeResultInFe(CascadesContext cascadesContext, Optional<SqlCacheContext> sqlCacheContext); | ||
| } |
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