| /* |
| * 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.beam.sdk.extensions.sql.impl.parser; |
| |
| import static org.apache.beam.vendor.calcite.v1_26_0.org.apache.calcite.util.Static.RESOURCE; |
| |
| import java.lang.reflect.Method; |
| import java.util.Arrays; |
| import java.util.List; |
| import java.util.Objects; |
| import org.apache.beam.sdk.extensions.sql.impl.JavaUdfLoader; |
| import org.apache.beam.sdk.extensions.sql.impl.LazyAggregateCombineFn; |
| import org.apache.beam.sdk.extensions.sql.impl.ScalarFnReflector; |
| import org.apache.beam.sdk.extensions.sql.impl.ScalarFunctionImpl; |
| import org.apache.beam.sdk.extensions.sql.udf.ScalarFn; |
| import org.apache.beam.vendor.calcite.v1_26_0.org.apache.calcite.jdbc.CalcitePrepare; |
| import org.apache.beam.vendor.calcite.v1_26_0.org.apache.calcite.jdbc.CalciteSchema; |
| import org.apache.beam.vendor.calcite.v1_26_0.org.apache.calcite.schema.Function; |
| import org.apache.beam.vendor.calcite.v1_26_0.org.apache.calcite.schema.SchemaPlus; |
| import org.apache.beam.vendor.calcite.v1_26_0.org.apache.calcite.sql.SqlCharStringLiteral; |
| import org.apache.beam.vendor.calcite.v1_26_0.org.apache.calcite.sql.SqlCreate; |
| import org.apache.beam.vendor.calcite.v1_26_0.org.apache.calcite.sql.SqlIdentifier; |
| import org.apache.beam.vendor.calcite.v1_26_0.org.apache.calcite.sql.SqlKind; |
| import org.apache.beam.vendor.calcite.v1_26_0.org.apache.calcite.sql.SqlNode; |
| import org.apache.beam.vendor.calcite.v1_26_0.org.apache.calcite.sql.SqlOperator; |
| import org.apache.beam.vendor.calcite.v1_26_0.org.apache.calcite.sql.SqlSpecialOperator; |
| import org.apache.beam.vendor.calcite.v1_26_0.org.apache.calcite.sql.SqlUtil; |
| import org.apache.beam.vendor.calcite.v1_26_0.org.apache.calcite.sql.SqlWriter; |
| import org.apache.beam.vendor.calcite.v1_26_0.org.apache.calcite.sql.parser.SqlParserPos; |
| import org.apache.beam.vendor.calcite.v1_26_0.org.apache.calcite.util.Pair; |
| import org.apache.beam.vendor.guava.v26_0_jre.com.google.common.collect.ImmutableList; |
| |
| /** Parse tree for {@code CREATE FUNCTION} statement. */ |
| public class SqlCreateFunction extends SqlCreate implements BeamSqlParser.ExecutableStatement { |
| private final boolean isAggregate; |
| private final SqlIdentifier functionName; |
| private final SqlNode jarPath; |
| |
| private static final SqlSpecialOperator OPERATOR = |
| new SqlSpecialOperator("CREATE FUNCTION", SqlKind.CREATE_FUNCTION); |
| |
| /** Creates a SqlCreateFunction. */ |
| public SqlCreateFunction( |
| SqlParserPos pos, |
| boolean replace, |
| SqlIdentifier functionName, |
| SqlNode jarPath, |
| boolean isAggregate) { |
| super(OPERATOR, pos, replace, false); |
| this.functionName = Objects.requireNonNull(functionName, "functionName"); |
| this.jarPath = Objects.requireNonNull(jarPath, "jarPath"); |
| this.isAggregate = isAggregate; |
| } |
| |
| @Override |
| public void unparse(SqlWriter writer, int leftPrec, int rightPrec) { |
| writer.keyword("CREATE"); |
| if (isAggregate) { |
| writer.keyword("AGGREGATE"); |
| } |
| writer.keyword("FUNCTION"); |
| functionName.unparse(writer, 0, 0); |
| writer.keyword("USING JAR"); |
| jarPath.unparse(writer, 0, 0); |
| } |
| |
| @Override |
| public SqlOperator getOperator() { |
| return OPERATOR; |
| } |
| |
| @Override |
| public List<SqlNode> getOperandList() { |
| return Arrays.asList(functionName, jarPath); |
| } |
| |
| @Override |
| public void execute(CalcitePrepare.Context context) { |
| final Pair<CalciteSchema, String> pair = SqlDdlNodes.schema(context, true, functionName); |
| SchemaPlus schema = pair.left.plus(); |
| String lastName = pair.right; |
| if (!schema.getFunctions(lastName).isEmpty()) { |
| throw SqlUtil.newContextException( |
| functionName.getParserPosition(), |
| RESOURCE.internal(String.format("Function %s is already defined.", lastName))); |
| } |
| JavaUdfLoader udfLoader = new JavaUdfLoader(); |
| // TODO(BEAM-12355) Support qualified function names. |
| List<String> functionPath = ImmutableList.of(lastName); |
| if (!(jarPath instanceof SqlCharStringLiteral)) { |
| throw SqlUtil.newContextException( |
| jarPath.getParserPosition(), |
| RESOURCE.internal("Jar path is not instanceof SqlCharStringLiteral.")); |
| } |
| String unquotedJarPath = ((SqlCharStringLiteral) jarPath).getNlsString().getValue(); |
| if (isAggregate) { |
| // Try loading the aggregate function just to make sure it exists. LazyAggregateCombineFn will |
| // need to fetch it again at runtime. |
| udfLoader.loadAggregateFunction(functionPath, unquotedJarPath); |
| LazyAggregateCombineFn<?, ?, ?> combineFn = |
| new LazyAggregateCombineFn<>(functionPath, unquotedJarPath); |
| schema.add(lastName, combineFn.getUdafImpl()); |
| } else { |
| ScalarFn scalarFn = udfLoader.loadScalarFunction(functionPath, unquotedJarPath); |
| Method method = ScalarFnReflector.getApplyMethod(scalarFn); |
| Function function = ScalarFunctionImpl.create(method, unquotedJarPath); |
| schema.add(lastName, function); |
| } |
| } |
| } |