nateab commented on code in PR #25115: URL: https://github.com/apache/flink/pull/25115#discussion_r1800150565
########## flink-table/flink-table-api-java/src/main/java/org/apache/flink/table/operations/DescribeFunctionOperation.java: ########## @@ -0,0 +1,125 @@ +/* + * 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.CatalogFunction; +import org.apache.flink.table.catalog.ContextResolvedFunction; +import org.apache.flink.table.catalog.UnresolvedIdentifier; +import org.apache.flink.table.functions.FunctionDefinition; +import org.apache.flink.table.types.DataType; + +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 java.util.Optional; + +import static org.apache.flink.table.api.internal.TableResultUtils.buildTableResult; +import static org.apache.flink.table.types.inference.TypeInferenceUtil.generateSignature; + +/** + * Operation to describe a DESCRIBE [EXTENDED] [[catalogName.] dataBasesName].sqlIdentifier + * statement. + */ +@Internal +public class DescribeFunctionOperation implements Operation, ExecutableOperation { + + private final UnresolvedIdentifier sqlIdentifier; + private final boolean isExtended; + + public DescribeFunctionOperation(UnresolvedIdentifier sqlIdentifier, boolean isExtended) { + this.sqlIdentifier = sqlIdentifier; + this.isExtended = isExtended; + } + + public UnresolvedIdentifier getSqlIdentifier() { + return sqlIdentifier; + } + + public boolean isExtended() { + return isExtended; + } + + @Override + public String asSummaryString() { + Map<String, Object> params = new LinkedHashMap<>(); + params.put("identifier", sqlIdentifier); + params.put("isExtended", isExtended); + return OperationUtils.formatWithChildren( + "DESCRIBE FUNCTION", params, Collections.emptyList(), Operation::asSummaryString); + } + + @Override + public TableResultInternal execute(Context ctx) { + // DESCRIBE FUNCTION <function> shows all the function properties. + Optional<ContextResolvedFunction> functionOpt = + ctx.getFunctionCatalog().lookupFunction(sqlIdentifier); + if (!functionOpt.isPresent()) { + throw new ValidationException( + String.format( + "Function with the identifier '%s' doesn't exist.", + sqlIdentifier.asSummaryString())); + } + final ContextResolvedFunction function = functionOpt.get(); + final CatalogFunction catalogFunction = function.getCatalogFunction(); + + List<List<Object>> rows = new ArrayList<>(); + rows.add(Arrays.asList("system function", String.valueOf(catalogFunction == null))); + rows.add(Arrays.asList("temporary", String.valueOf(function.isTemporary()))); + if (catalogFunction != null) { + rows.add(Arrays.asList("class name", catalogFunction.getClassName())); + rows.add( + Arrays.asList( + "function language", catalogFunction.getFunctionLanguage().toString())); + rows.add( + Arrays.asList( + "resource uris", catalogFunction.getFunctionResources().toString())); + } + + if (isExtended) { + final FunctionDefinition definition = function.getDefinition(); + rows.add(Arrays.asList("kind", definition.getKind().toString())); + rows.add(Arrays.asList("requirements", definition.getRequirements().toString())); + rows.add(Arrays.asList("deterministic", String.valueOf(definition.isDeterministic()))); Review Comment: added -- 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
