| // 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.impala.analysis; |
| |
| import java.util.List; |
| |
| import org.apache.impala.authorization.Privilege; |
| import org.apache.impala.catalog.FeDb; |
| import org.apache.impala.catalog.Function; |
| import org.apache.impala.common.AnalysisException; |
| import org.apache.impala.thrift.TFunctionCategory; |
| import org.apache.impala.thrift.TGetFunctionsParams; |
| |
| import com.google.common.base.Preconditions; |
| |
| /** |
| * Representation of a SHOW CREATE FUNCTION statement which returns the "CREATE FUNCTION ..." |
| * string that re-creates the function. |
| * |
| * Syntax: SHOW CREATE [AGGREGATE] FUNCTION [<db_name>.]<function_name> |
| */ |
| public class ShowCreateFunctionStmt extends StatementBase { |
| private final FunctionName functionName_; |
| private final TFunctionCategory category_; |
| |
| public ShowCreateFunctionStmt(FunctionName functionName, TFunctionCategory category) { |
| Preconditions.checkNotNull(functionName); |
| Preconditions.checkArgument(category == TFunctionCategory.SCALAR || |
| category == TFunctionCategory.AGGREGATE); |
| functionName_ = functionName; |
| category_ = category; |
| } |
| |
| @Override |
| public String toSql(ToSqlOptions options) { |
| return "SHOW CREATE " + |
| (category_ == TFunctionCategory.AGGREGATE ? "AGGREGATE " : "") + |
| "FUNCTION " + functionName_; |
| } |
| |
| @Override |
| public void analyze(Analyzer analyzer) throws AnalysisException { |
| functionName_.analyze(analyzer); |
| FeDb db = analyzer.getDb(functionName_.getDb(), Privilege.VIEW_METADATA); |
| List<Function> functions = db.getFunctions(category_, functionName_.getFunction()); |
| if (functions.isEmpty()) { |
| throw new AnalysisException("Function " + functionName_.getFunction() + "() " + |
| "does not exist in database " + functionName_.getDb()); |
| } |
| } |
| |
| public TGetFunctionsParams toThrift() { |
| TGetFunctionsParams params = new TGetFunctionsParams(); |
| params.setCategory(category_); |
| params.setDb(functionName_.getDb()); |
| params.setPattern(functionName_.getFunction()); |
| return params; |
| } |
| } |