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84
presto-main/src/main/java/io/prestosql/sql/planner/iterative/rule/PushTopNIntoTableScan.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,84 @@ | ||
| /* | ||
| * Licensed 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 io.prestosql.sql.planner.iterative.rule; | ||
|
|
||
| import io.prestosql.matching.Capture; | ||
| import io.prestosql.matching.Captures; | ||
| import io.prestosql.matching.Pattern; | ||
| import io.prestosql.metadata.Metadata; | ||
| import io.prestosql.spi.connector.ColumnHandle; | ||
| import io.prestosql.spi.connector.SortItem; | ||
| import io.prestosql.sql.planner.iterative.Rule; | ||
| import io.prestosql.sql.planner.plan.PlanNode; | ||
| import io.prestosql.sql.planner.plan.TableScanNode; | ||
| import io.prestosql.sql.planner.plan.TopNNode; | ||
|
|
||
| import java.util.List; | ||
| import java.util.Map; | ||
|
|
||
| import static com.google.common.collect.ImmutableMap.toImmutableMap; | ||
| import static io.prestosql.matching.Capture.newCapture; | ||
| import static io.prestosql.sql.planner.plan.Patterns.source; | ||
| import static io.prestosql.sql.planner.plan.Patterns.tableScan; | ||
| import static io.prestosql.sql.planner.plan.Patterns.topN; | ||
|
|
||
| public class PushTopNIntoTableScan | ||
| implements Rule<TopNNode> | ||
| { | ||
| private static final Capture<TableScanNode> TABLE_SCAN = newCapture(); | ||
|
|
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| private static final Pattern<TopNNode> PATTERN = topN().with(source().matching( | ||
| tableScan().capturedAs(TABLE_SCAN))); | ||
|
|
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| private final Metadata metadata; | ||
|
|
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| public PushTopNIntoTableScan(Metadata metadata) | ||
| { | ||
| this.metadata = metadata; | ||
| } | ||
|
|
||
| @Override | ||
| public Pattern<TopNNode> getPattern() | ||
| { | ||
| return PATTERN; | ||
| } | ||
|
|
||
| @Override | ||
| public Result apply(TopNNode topNNode, Captures captures, Context context) | ||
| { | ||
| TableScanNode tableScan = captures.get(TABLE_SCAN); | ||
|
|
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| long topNCount = topNNode.getCount(); | ||
| List<SortItem> sortItems = topNNode.getOrderingScheme().toSortItems(); | ||
|
|
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| Map<String, ColumnHandle> assignments = tableScan.getAssignments() | ||
| .entrySet().stream() | ||
| .collect(toImmutableMap(entry -> entry.getKey().getName(), Map.Entry::getValue)); | ||
|
|
||
| return metadata.applyTopN(context.getSession(), tableScan.getTable(), topNCount, sortItems, assignments) | ||
| .map(result -> { | ||
| PlanNode node = TableScanNode.newInstance( | ||
| context.getIdAllocator().getNextId(), | ||
| result.getHandle(), | ||
| tableScan.getOutputSymbols(), | ||
| tableScan.getAssignments()); | ||
|
|
||
| if (!result.isTopNGuaranteed()) { | ||
| node = new TopNNode(topNNode.getId(), node, topNNode.getCount(), topNNode.getOrderingScheme(), TopNNode.Step.FINAL); | ||
| } | ||
| return Result.ofPlanNode(node); | ||
| }) | ||
| .orElseGet(Result::empty); | ||
| } | ||
| } |
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