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84 changes: 84 additions & 0 deletions
84
sql/src/main/java/io/crate/planner/consumer/OrderByPositionVisitor.java
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,84 @@ | ||
| /* | ||
| * Licensed to CRATE Technology GmbH ("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. | ||
| */ | ||
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| package io.crate.planner.consumer; | ||
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| import com.carrotsearch.hppc.IntArrayList; | ||
| import io.crate.planner.symbol.*; | ||
| import org.elasticsearch.common.inject.Singleton; | ||
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| import java.util.List; | ||
|
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| /** | ||
| * Extract 0-based integer positions for order by symbols. | ||
| * | ||
| * This can only be used under the following restriction: | ||
| * <ul> | ||
| * <li>if an <code>orderBySymbol</code> is no input column with explicit index, | ||
| * it must be part of <code>sourceSymbols</code>. | ||
| */ | ||
| @Singleton | ||
| public class OrderByPositionVisitor extends SymbolVisitor<OrderByPositionVisitor.Context, Void> { | ||
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| private static OrderByPositionVisitor INSTANCE = new OrderByPositionVisitor(); | ||
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| public static class Context { | ||
| final List<Symbol> sourceSymbols; | ||
| IntArrayList orderByPositions; | ||
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| public Context(List<Symbol> sourceSymbols) { | ||
| this.sourceSymbols = sourceSymbols; | ||
| this.orderByPositions = new IntArrayList(); | ||
| } | ||
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| public int[] orderByPositions() { | ||
| return orderByPositions.toArray(); | ||
| } | ||
| } | ||
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| private OrderByPositionVisitor() { | ||
| } | ||
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| public static int[] orderByPositions(List<Symbol> orderBySymbols, List<Symbol> sourceSymbols) { | ||
| Context context = new Context(sourceSymbols); | ||
| for (Symbol orderBySymbol : orderBySymbols) { | ||
| INSTANCE.process(orderBySymbol, context); | ||
| } | ||
| return context.orderByPositions(); | ||
| } | ||
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| @Override | ||
| public Void visitInputColumn(InputColumn inputColumn, Context context) { | ||
| context.orderByPositions.add(inputColumn.index()); | ||
| return null; | ||
| } | ||
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| @Override | ||
| protected Void visitSymbol(Symbol symbol, Context context) { | ||
| int idx = context.sourceSymbols.indexOf(symbol); | ||
| if (idx >= 0) { | ||
| context.orderByPositions.add(idx); | ||
| } else { | ||
| throw new IllegalArgumentException(SymbolFormatter.format("Cannot sort by: %s - not part of source symbols", symbol)); | ||
| } | ||
| return null; | ||
| } | ||
| } |
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