shuwenwei commented on code in PR #14617: URL: https://github.com/apache/iotdb/pull/14617#discussion_r2048590961
########## iotdb-core/datanode/src/main/java/org/apache/iotdb/db/queryengine/plan/execution/config/metadata/relational/ShowCreateTableTask.java: ########## @@ -0,0 +1,138 @@ +/* + * 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.db.queryengine.plan.execution.config.metadata.relational; + +import org.apache.iotdb.commons.schema.column.ColumnHeader; +import org.apache.iotdb.commons.schema.column.ColumnHeaderConstant; +import org.apache.iotdb.commons.schema.table.TreeViewSchema; +import org.apache.iotdb.commons.schema.table.TsTable; +import org.apache.iotdb.commons.schema.table.column.TsTableColumnSchema; +import org.apache.iotdb.db.queryengine.common.header.DatasetHeader; +import org.apache.iotdb.db.queryengine.common.header.DatasetHeaderFactory; +import org.apache.iotdb.db.queryengine.plan.execution.config.ConfigTaskResult; +import org.apache.iotdb.db.queryengine.plan.execution.config.executor.IConfigTaskExecutor; +import org.apache.iotdb.rpc.TSStatusCode; + +import com.google.common.util.concurrent.ListenableFuture; +import com.google.common.util.concurrent.SettableFuture; +import org.apache.tsfile.common.conf.TSFileConfig; +import org.apache.tsfile.enums.TSDataType; +import org.apache.tsfile.read.common.block.TsBlockBuilder; +import org.apache.tsfile.utils.Binary; + +import java.util.List; +import java.util.Objects; +import java.util.stream.Collectors; + +public class ShowCreateTableTask extends AbstractTableTask { + public ShowCreateTableTask(final String database, final String tableName) { + super(database, tableName); + } + + @Override + public ListenableFuture<ConfigTaskResult> execute(final IConfigTaskExecutor configTaskExecutor) + throws InterruptedException { + return configTaskExecutor.describeTable(database, tableName, false, false); + } + + public static void buildTsBlock( + final TsTable table, final SettableFuture<ConfigTaskResult> future) { + if (TreeViewSchema.isTreeViewTable(table)) { + ShowCreateViewTask.buildTsBlock(table, future); + return; + } + final List<TSDataType> outputDataTypes = + ColumnHeaderConstant.showCreateTableColumnHeaders.stream() + .map(ColumnHeader::getColumnType) + .collect(Collectors.toList()); + + final TsBlockBuilder builder = new TsBlockBuilder(outputDataTypes); + builder.getTimeColumnBuilder().writeLong(0L); + builder + .getColumnBuilder(0) + .writeBinary(new Binary(table.getTableName(), TSFileConfig.STRING_CHARSET)); + builder + .getColumnBuilder(1) + .writeBinary(new Binary(getShowCreateTableSQL(table), TSFileConfig.STRING_CHARSET)); + builder.declarePosition(); + + final DatasetHeader datasetHeader = DatasetHeaderFactory.getShowCreateTableColumnHeader(); + future.set(new ConfigTaskResult(TSStatusCode.SUCCESS_STATUS, builder.build(), datasetHeader)); + } + + private static String getShowCreateTableSQL(final TsTable table) { + final StringBuilder builder = + new StringBuilder("CREATE TABLE \"").append(table.getTableName()).append("\" ("); + + for (final TsTableColumnSchema schema : table.getColumnList()) { + switch (schema.getColumnCategory()) { + case TAG: + builder + .append(schema.getColumnName()) + .append(" ") + .append(schema.getDataType()) + .append(" ") + .append("TAG"); + break; + case TIME: + continue; + case FIELD: + builder + .append(schema.getColumnName()) Review Comment: Is it necessary to ensure that the final output SQL can be successfully executed? If a column name is s"0, does it need special processing? -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
