liyubin117 commented on code in PR #24630: URL: https://github.com/apache/flink/pull/24630#discussion_r1570448160
########## flink-table/flink-table-api-java/src/main/java/org/apache/flink/table/operations/DescribeCatalogOperation.java: ########## @@ -0,0 +1,114 @@ +/* + * 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.flink.table.operations; + +import org.apache.flink.annotation.Internal; +import org.apache.flink.table.api.DataTypes; +import org.apache.flink.table.api.ValidationException; +import org.apache.flink.table.api.internal.TableResultInternal; +import org.apache.flink.table.catalog.CatalogDescriptor; +import org.apache.flink.table.catalog.CommonCatalogOptions; +import org.apache.flink.table.types.DataType; +import org.apache.flink.table.utils.EncodingUtils; + +import java.util.ArrayList; +import java.util.Arrays; +import java.util.Collections; +import java.util.LinkedHashMap; +import java.util.List; +import java.util.Map; + +import static org.apache.flink.table.api.internal.TableResultUtils.buildTableResult; + +/** Operation to describe a DESCRIBE CATALOG catalog_name statement. */ +@Internal +public class DescribeCatalogOperation implements Operation, ExecutableOperation { + + private final String catalogName; + private final boolean isExtended; + + public DescribeCatalogOperation(String catalogName, boolean isExtended) { + this.catalogName = catalogName; + this.isExtended = isExtended; + } + + public String getCatalogName() { + return catalogName; + } + + public boolean isExtended() { + return isExtended; + } + + @Override + public String asSummaryString() { + Map<String, Object> params = new LinkedHashMap<>(); + params.put("identifier", catalogName); + params.put("isExtended", isExtended); + return OperationUtils.formatWithChildren( + "DESCRIBE CATALOG", params, Collections.emptyList(), Operation::asSummaryString); + } + + @Override + public TableResultInternal execute(Context ctx) { + CatalogDescriptor catalogDescriptor = + ctx.getCatalogManager() + .getCatalogDescriptor(catalogName) + .orElseThrow( + () -> + new ValidationException( + String.format( + "Cannot obtain metadata information from Catalog %s.", + catalogName))); + Map<String, String> properties = catalogDescriptor.getConfiguration().toMap(); + List<List<Object>> rows = + new ArrayList<>( + Arrays.asList( + Arrays.asList("Name", catalogName), + Arrays.asList( + "Type", + properties.getOrDefault( + CommonCatalogOptions.CATALOG_TYPE.key(), "")), + Arrays.asList("Comment", "") // TODO: retain for future needs + )); + if (isExtended) { + rows.add(Arrays.asList("Properties", convertPropertiesToString(properties))); + } + + return buildTableResult( + Arrays.asList("catalog_description_item", "catalog_description_value") + .toArray(new String[0]), + Arrays.asList(DataTypes.STRING(), DataTypes.STRING()).toArray(new DataType[0]), + rows.stream().map(List::toArray).toArray(Object[][]::new)); + } + + private String convertPropertiesToString(Map<String, String> map) { + StringBuilder stringBuilder = new StringBuilder(); + for (Map.Entry<String, String> entry : map.entrySet()) { + stringBuilder.append( + String.format( + "('%s','%s'), ", + EncodingUtils.escapeSingleQuotes(entry.getKey()), + EncodingUtils.escapeSingleQuotes(entry.getValue()))); + } + // remove the last unnecessary comma and space + stringBuilder.delete(stringBuilder.length() - 2, stringBuilder.length()); + return stringBuilder.toString(); Review Comment: Elegant ~ -- 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: issues-unsubscr...@flink.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org
