Alima777 commented on a change in pull request #902: URL: https://github.com/apache/incubator-iotdb/pull/902#discussion_r487762031
########## File path: calcite/src/main/java/org/apache/iotdb/calcite/IoTDBFilter.java ########## @@ -0,0 +1,321 @@ +/* + * 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. + */ +package org.apache.iotdb.calcite; + +import java.util.ArrayList; +import java.util.Iterator; +import java.util.LinkedHashMap; +import java.util.List; +import java.util.Map; +import org.apache.calcite.plan.RelOptCluster; +import org.apache.calcite.plan.RelOptCost; +import org.apache.calcite.plan.RelOptPlanner; +import org.apache.calcite.plan.RelTraitSet; +import org.apache.calcite.rel.RelNode; +import org.apache.calcite.rel.core.Filter; +import org.apache.calcite.rel.metadata.RelMetadataQuery; +import org.apache.calcite.rex.RexCall; +import org.apache.calcite.rex.RexInputRef; +import org.apache.calcite.rex.RexLiteral; +import org.apache.calcite.rex.RexNode; +import org.apache.calcite.util.Util; +import org.apache.iotdb.db.exception.query.LogicalOptimizeException; +import org.apache.iotdb.db.qp.constant.SQLConstant; +import org.apache.iotdb.db.qp.logical.crud.BasicFunctionOperator; +import org.apache.iotdb.db.qp.logical.crud.FilterOperator; +import org.apache.iotdb.db.qp.strategy.optimizer.DnfFilterOptimizer; +import org.apache.iotdb.tsfile.read.common.Path; + +public class IoTDBFilter extends Filter implements IoTDBRel { + + private final FilterOperator filterOperator; + private final List<String> fieldNames; + private List<String> predicates; // for global predicate + Map<String, String> deviceToFilterMap = new LinkedHashMap<>(); // for device predicate + + protected IoTDBFilter(RelOptCluster cluster, RelTraitSet traits, RelNode child, RexNode condition) + throws LogicalOptimizeException { + super(cluster, traits, child, condition); + this.fieldNames = IoTDBRules.IoTDBFieldNames(getRowType()); + this.filterOperator = getIoTDBOperator(condition); + this.predicates = translateWhere(filterOperator); + + // add global predicate to each device if both global and device predicate exist + if (!this.predicates.isEmpty() && !this.deviceToFilterMap.isEmpty()) { + for (String device : deviceToFilterMap.keySet()) { + StringBuilder builder = new StringBuilder(this.deviceToFilterMap.get(device)); + builder.append(Util.toString(predicates, " OR ", " OR ", "")); + this.deviceToFilterMap.put(device, builder.toString()); + } + } + assert getConvention() == IoTDBRel.CONVENTION; + assert getConvention() == child.getConvention(); + } + + @Override + public RelOptCost computeSelfCost(RelOptPlanner planner, + RelMetadataQuery mq) { + return super.computeSelfCost(planner, mq).multiplyBy(0.1); + } + + @Override + public Filter copy(RelTraitSet relTraitSet, RelNode input, RexNode condition) { + try { + return new IoTDBFilter(getCluster(), traitSet, input, condition); + } catch (LogicalOptimizeException e) { + throw new AssertionError(e.getMessage()); + } + } + + @Override + public void implement(Implementor implementor) { + implementor.visitChild(0, getInput()); + implementor.add(deviceToFilterMap, predicates); + } + + /** + * Translates {@link RexNode} expressions into IoTDB filter operator. + */ + private FilterOperator getIoTDBOperator(RexNode filter) { + switch (filter.getKind()) { + case EQUALS: + return getBasicOperator(SQLConstant.EQUAL, (RexCall) filter); + case NOT_EQUALS: + return getBasicOperator(SQLConstant.NOTEQUAL, (RexCall) filter); + case GREATER_THAN: + return getBasicOperator(SQLConstant.GREATERTHAN, (RexCall) filter); + case GREATER_THAN_OR_EQUAL: + return getBasicOperator(SQLConstant.GREATERTHANOREQUALTO, (RexCall) filter); + case LESS_THAN: + return getBasicOperator(SQLConstant.LESSTHAN, (RexCall) filter); + case LESS_THAN_OR_EQUAL: + return getBasicOperator(SQLConstant.LESSTHANOREQUALTO, (RexCall) filter); + case AND: + return getBinaryOperator(SQLConstant.KW_AND, ((RexCall) filter).getOperands()); + case OR: + return getBinaryOperator(SQLConstant.KW_OR, ((RexCall) filter).getOperands()); + default: + throw new AssertionError("cannot get IoTDBOperator from " + filter); Review comment: I just used it for convenience before...Sorry, I've added a new exception for it. ---------------------------------------------------------------- This is an automated message from the Apache Git Service. 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