/* * Licensed to Crate under one or more contributor license agreements. * See the NOTICE file distributed with this work for additional * information regarding copyright ownership. Crate 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. * * However, if you have executed another commercial license agreement * with Crate these terms will supersede the license and you may use the * software solely pursuant to the terms of the relevant commercial * agreement. */ package io.crate.operation.collect.sources; import com.google.common.collect.Iterables; import com.google.common.collect.Ordering; import io.crate.analyze.OrderBy; import io.crate.analyze.symbol.Reference; import io.crate.analyze.symbol.Symbol; import io.crate.analyze.symbol.Symbols; import io.crate.core.collections.Row; import io.crate.metadata.Functions; import io.crate.metadata.ReferenceInfo; import io.crate.metadata.table.TableInfo; import io.crate.metadata.tablefunctions.TableFunctionImplementation; import io.crate.operation.BaseImplementationSymbolVisitor; import io.crate.operation.Input; import io.crate.operation.InputRow; import io.crate.operation.collect.CrateCollector; import io.crate.operation.collect.InputCollectExpression; import io.crate.operation.collect.JobCollectContext; import io.crate.operation.collect.RowsCollector; import io.crate.operation.projectors.RowReceiver; import io.crate.operation.projectors.sorting.OrderingByPosition; import io.crate.planner.node.dql.CollectPhase; import io.crate.planner.node.dql.TableFunctionCollectPhase; import org.elasticsearch.cluster.ClusterService; import org.elasticsearch.common.inject.Inject; import org.elasticsearch.common.inject.Singleton; import java.util.ArrayList; import java.util.Collection; import java.util.Collections; import java.util.List; @Singleton public class TableFunctionCollectSource implements CollectSource { private final ClusterService clusterService; private final Functions functions; private final TableFunctionImplementationVisitor implementationVisitor; @Inject public TableFunctionCollectSource(ClusterService clusterService, Functions functions) { this.clusterService = clusterService; this.functions = functions; implementationVisitor = new TableFunctionImplementationVisitor(functions); } @Override public Collection<CrateCollector> getCollectors(CollectPhase collectPhase, RowReceiver downstream, JobCollectContext jobCollectContext) { TableFunctionCollectPhase phase = (TableFunctionCollectPhase) collectPhase; TableFunctionImplementation tableFunctionSafe = functions.getTableFunctionSafe(phase.functionName()); TableInfo tableInfo = tableFunctionSafe.createTableInfo(clusterService, Symbols.extractTypes(phase.arguments())); //noinspection unchecked Only literals can be passed to table functions. Anything else is invalid SQL List<Input<?>> inputs = (List<Input<?>>) (List) phase.arguments(); final Context context = new Context(new ArrayList<>(tableInfo.columns())); List<Input<?>> topLevelInputs = new ArrayList<>(phase.toCollect().size()); for (Symbol symbol : phase.toCollect()) { topLevelInputs.add(implementationVisitor.process(symbol, context)); } Iterable<Row> rows = Iterables.transform( tableFunctionSafe.execute(inputs), InputRow.toInputRowFunction(topLevelInputs, context.collectExpressions)); OrderBy orderBy = phase.orderBy(); if (orderBy != null) { rows = SystemCollectSource.sortRows(Iterables.transform(rows, Row.MATERIALIZE), phase); } RowsCollector rowsCollector = new RowsCollector(downstream, rows); return Collections.<CrateCollector>singletonList(rowsCollector); } private static class Context { final List<ReferenceInfo> columns; final List<InputCollectExpression> collectExpressions = new ArrayList<>(); public Context(List<ReferenceInfo> columns) { this.columns = columns; } } private static final class TableFunctionImplementationVisitor extends BaseImplementationSymbolVisitor<Context> { public TableFunctionImplementationVisitor(Functions functions) { super(functions); } @Override public Input<?> visitReference(Reference symbol, Context context) { int position = context.columns.indexOf(symbol.info()); InputCollectExpression collectExpression = new InputCollectExpression(position); context.collectExpressions.add(collectExpression); return collectExpression; } } }