Alima777 commented on a change in pull request #902: URL: https://github.com/apache/incubator-iotdb/pull/902#discussion_r487762459
########## File path: calcite/src/main/java/org/apache/iotdb/calcite/IoTDBRel.java ########## @@ -0,0 +1,86 @@ +/* + * 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.LinkedHashMap; +import java.util.List; +import java.util.Map; +import org.apache.calcite.plan.Convention; +import org.apache.calcite.plan.RelOptTable; +import org.apache.calcite.rel.RelNode; + +public interface IoTDBRel extends RelNode { + + void implement(Implementor implementor); + + /** + * Calling convention for relational operations that occur in IoTDB. + */ + Convention CONVENTION = new Convention.Impl("IOTDB", IoTDBRel.class); + + /** + * Callback for the implementation process that converts a tree of {@link IoTDBRel} nodes into a + * IoTDB SQL query. + */ + class Implementor { + + final List<String> selectFields = new ArrayList<>(); + final Map<String, String> deviceToFilterMap = new LinkedHashMap<>(); + final List<String> globalPredicate = new ArrayList<>(); + int limit = 0; + int offset = 0; + + RelOptTable table; + IoTDBTable ioTDBTable; + + /** + * Adds newly projected fields. + * + * @param fields New fields to be projected from a query + */ + public void addFields(List<String> fields) { + if (selectFields != null) { + selectFields.addAll(fields); + } + } + + /** + * Adds newly restricted devices and predicates. + * + * @param deviceToFilterMap predicate of given device + * @param predicates global predicates to be applied to the query + */ + public void add(Map<String, String> deviceToFilterMap, List<String> predicates) { + if (this.deviceToFilterMap != null) { Review comment: You are right! I've removed it. ########## File path: calcite/src/main/java/org/apache/iotdb/calcite/IoTDBTable.java ########## @@ -0,0 +1,306 @@ +/* + * 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 com.google.common.collect.ImmutableList; +import java.sql.Connection; +import java.sql.ResultSet; +import java.sql.SQLException; +import java.sql.Statement; +import java.util.ArrayList; +import java.util.HashSet; +import java.util.List; +import java.util.Map; +import java.util.Map.Entry; +import java.util.Set; +import org.apache.calcite.adapter.java.AbstractQueryableTable; +import org.apache.calcite.linq4j.AbstractEnumerable; +import org.apache.calcite.linq4j.Enumerable; +import org.apache.calcite.linq4j.Enumerator; +import org.apache.calcite.linq4j.QueryProvider; +import org.apache.calcite.linq4j.Queryable; +import org.apache.calcite.linq4j.function.Function1; +import org.apache.calcite.plan.RelOptCluster; +import org.apache.calcite.plan.RelOptTable; +import org.apache.calcite.rel.RelNode; +import org.apache.calcite.rel.type.RelDataType; +import org.apache.calcite.rel.type.RelDataTypeFactory; +import org.apache.calcite.rel.type.RelDataTypeImpl; +import org.apache.calcite.rel.type.RelDataTypeSystem; +import org.apache.calcite.rel.type.RelProtoDataType; +import org.apache.calcite.schema.SchemaPlus; +import org.apache.calcite.schema.TranslatableTable; +import org.apache.calcite.schema.impl.AbstractTableQueryable; +import org.apache.calcite.sql.type.SqlTypeFactoryImpl; +import org.apache.calcite.sql.type.SqlTypeName; +import org.apache.calcite.util.Util; +import org.apache.iotdb.db.exception.query.QueryProcessException; + +public class IoTDBTable extends AbstractQueryableTable + implements TranslatableTable { + + RelProtoDataType protoRowType; + private final IoTDBSchema schema; + private final String storageGroup; + + public IoTDBTable(IoTDBSchema schema, String storageGroup) { + super(Object[].class); + this.schema = schema; + this.storageGroup = storageGroup; + } + + public String toString() { + return "IoTDBTable {" + storageGroup + "}"; + } + + @Override + public RelDataType getRowType(RelDataTypeFactory typeFactory) { + try { + if (protoRowType == null) { + protoRowType = schema.getRelDataType(storageGroup); + } + } catch (SQLException | QueryProcessException e) { + // print exception error here + e.printStackTrace(); + } + return protoRowType.apply(typeFactory); + } + + @Override + public <T> Queryable<T> asQueryable(QueryProvider queryProvider, SchemaPlus schema, + String tableName) { + return new IoTDBQueryable<>(queryProvider, schema, this, storageGroup); + } + + @Override + public RelNode toRel(RelOptTable.ToRelContext context, RelOptTable relOptTable) { + final RelOptCluster cluster = context.getCluster(); + return new IoTDBTableScan(cluster, cluster.traitSetOf(IoTDBRel.CONVENTION), + relOptTable, this, null); + } + + public Enumerable<Object> query(final Connection connection) { + return query(connection, ImmutableList.of(), ImmutableList.of(), ImmutableList.of(), + ImmutableList.of(), 0, 0); + } + + /** + * Executes a IoTDB SQL query. + * + * @param connection IoTDB connection + * @param fields List of fields to project + * @return Enumerator of results + */ + public Enumerable<Object> query(final Connection connection, + List<Map.Entry<String, Class>> fields, + final List<String> selectFields, final List<Map.Entry<String, String>> deviceToFilterList, + List<String> globalPredicates, final Integer limit, final Integer offset) { + // Build the type of the resulting row based on the provided fields + final RelDataTypeFactory typeFactory = + new SqlTypeFactoryImpl(RelDataTypeSystem.DEFAULT); + final RelDataTypeFactory.Builder fieldInfo = typeFactory.builder(); + final RelDataType rowType = getRowType(typeFactory); + + Function1<String, Void> addField = fieldName -> { + SqlTypeName typeName = + rowType.getField(fieldName, true, false).getType().getSqlTypeName(); + fieldInfo.add(fieldName, typeFactory.createSqlType(typeName)) + .nullable(true); + return null; + }; + + if (selectFields.isEmpty()) { + for (Map.Entry<String, Class> field : fields) { + addField.apply(field.getKey()); + } + } else { + for (String field : selectFields) { + if (field.startsWith("'")) { + fieldInfo.add(field, SqlTypeName.VARCHAR); + } else { + addField.apply(field); + } + } + } + + final RelProtoDataType resultRowType = RelDataTypeImpl.proto(fieldInfo.build()); + + // Construct the list of fields to project + String selectString = ""; + if (selectFields.isEmpty()) { + selectString = "*"; + } else { + // delete the 'time', 'device' string in select list + // this has to be here rather than init "selectFields" otherwise the resultRowType will be wrong + StringBuilder selectBuilder = new StringBuilder(); + for (int i = 0; i < selectFields.size(); i++) { + String selectField = selectFields.get(i); + if (selectField.equals(IoTDBConstant.DeviceColumn) || selectField + .equals(IoTDBConstant.TimeColumn)) { + continue; + } else { + selectBuilder.append(selectField); + if (i < selectFields.size() - 1) { + selectBuilder.append(", "); + } + } + } + selectString = selectBuilder.toString(); + if (selectString.equals("")) { + selectString = "*"; + } + } + + List<String> queryList = new ArrayList<>(); + Set<String> tmpDevices = new HashSet<>(); // to deduplicate in global query + // construct query by device + if (!deviceToFilterList.isEmpty()) { + for (Entry<String, String> deviceToFilter : deviceToFilterList) { + String fromClause = " FROM "; + fromClause += deviceToFilter.getKey(); + tmpDevices.add(deviceToFilter.getKey()); + + String whereClause = ""; + if (deviceToFilter.getValue() != null) { + whereClause = " WHERE "; + whereClause += deviceToFilter.getValue(); + } + + // Build and issue the query and return an Enumerator over the results + StringBuilder queryBuilder = new StringBuilder("SELECT "); + queryBuilder.append(selectString); + queryBuilder.append(fromClause); + queryBuilder.append(whereClause); + + if (limit > 0) { + queryBuilder.append(" LIMIT " + limit); + } + if (offset > 0) { + queryBuilder.append(" OFFSET " + offset); + } + + // append align by device + queryBuilder.append(" " + IoTDBConstant.AlignByDevice); + queryList.add(queryBuilder.toString()); + } + } + + // construct global query + if (deviceToFilterList.isEmpty() || !globalPredicates.isEmpty()) { + String fromClause = " FROM "; + // deduplicate redundant device + if (!deviceToFilterList.isEmpty() && !globalPredicates.isEmpty()) { Review comment: Removed. ---------------------------------------------------------------- This is an automated message from the Apache Git Service. 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