// Copyright 2021 EMQ Technologies Co., Ltd. // // Licensed 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. package planner type logicalOptRule interface { optimize(LogicalPlan) (LogicalPlan, error) name() string } type predicatePushDown struct{} func (r *predicatePushDown) optimize(lp LogicalPlan) (LogicalPlan, error) { _, p := lp.PushDownPredicate(nil) return p, nil } func (r *predicatePushDown) name() string { return "predicatePushDown" } type columnPruner struct{} func (r *columnPruner) optimize(lp LogicalPlan) (LogicalPlan, error) { err := lp.PruneColumns(nil) return lp, err } func (r *columnPruner) name() string { return "columnPruner" }