pgaref commented on code in PR #25115: URL: https://github.com/apache/flink/pull/25115#discussion_r1690799595
########## flink-table/flink-table-api-java/src/main/java/org/apache/flink/table/operations/DescribeFunctionOperation.java: ########## @@ -0,0 +1,129 @@ +/* + * 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.ObjectIdentifier; +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 ObjectIdentifier sqlIdentifier; + private final boolean isExtended; + + public DescribeFunctionOperation(ObjectIdentifier sqlIdentifier, boolean isExtended) { + this.sqlIdentifier = sqlIdentifier; + this.isExtended = isExtended; + } + + public ObjectIdentifier 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(UnresolvedIdentifier.of(sqlIdentifier)); + if (!functionOpt.isPresent()) { + throw new ValidationException( + String.format( + "Function with the identifier '%s' doesn't exist.", + sqlIdentifier.asSummaryString())); + } + ContextResolvedFunction function = functionOpt.get(); + CatalogFunction catalogFunction = function.getCatalogFunction(); + + if (catalogFunction == null && !isExtended) { + throw new ValidationException( + String.format( + "Function with the identifier '%s' is a system function which can only be described by using the extended keyword. Use 'DESCRIBE FUNCTION EXTENDED %s' to see its properties.", + sqlIdentifier.asSummaryString(), sqlIdentifier.asSummaryString())); + } + + List<List<Object>> rows = new ArrayList<>(); + 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())); + rows.add(Arrays.asList("temporary", function.isTemporary())); + } + + if (isExtended) { + 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", definition.isDeterministic())); + rows.add(Arrays.asList("constant folding", definition.supportsConstantFolding())); + rows.add( Review Comment: I understand the FLIP does not cover that, but why wont we include the Function return type here? -- This is an automated message from the Apache Git Service. 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