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[FLINK-21627][table-planner-blink] The digest of TableScan should con…
…sider table hints This closes apache#15559
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...nk-table-planner-blink/src/main/java/org/apache/calcite/rel/logical/LogicalTableScan.java
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| /* | ||
| * 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. | ||
| */ | ||
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| package org.apache.calcite.rel.logical; | ||
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| import com.google.common.collect.ImmutableList; | ||
| import org.apache.calcite.plan.Convention; | ||
| import org.apache.calcite.plan.RelOptCluster; | ||
| import org.apache.calcite.plan.RelOptTable; | ||
| import org.apache.calcite.plan.RelTraitSet; | ||
| import org.apache.calcite.rel.RelCollationTraitDef; | ||
| import org.apache.calcite.rel.RelInput; | ||
| import org.apache.calcite.rel.RelNode; | ||
| import org.apache.calcite.rel.RelWriter; | ||
| import org.apache.calcite.rel.core.TableScan; | ||
| import org.apache.calcite.rel.hint.RelHint; | ||
| import org.apache.calcite.schema.Table; | ||
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| import java.util.List; | ||
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| /** | ||
| * A <code>LogicalTableScan</code> reads all the rows from a {@link RelOptTable}. | ||
| * | ||
| * <p>This class is copied from Calcite because the {@link #explainTerms} should consider hints. | ||
| * | ||
| * <p>If the table is a <code>net.sf.saffron.ext.JdbcTable</code>, then this is literally possible. | ||
| * But for other kinds of tables, there may be many ways to read the data from the table. For some | ||
| * kinds of table, it may not even be possible to read all of the rows unless some narrowing | ||
| * constraint is applied. | ||
| * | ||
| * <p>In the example of the <code>net.sf.saffron.ext.ReflectSchema</code> schema, | ||
| * | ||
| * <blockquote> | ||
| * | ||
| * <pre>select from fields</pre> | ||
| * | ||
| * </blockquote> | ||
| * | ||
| * <p>cannot be implemented, but | ||
| * | ||
| * <blockquote> | ||
| * | ||
| * <pre>select from fields as f | ||
| * where f.getClass().getName().equals("java.lang.String")</pre> | ||
| * | ||
| * </blockquote> | ||
| * | ||
| * <p>can. It is the optimizer's responsibility to find these ways, by applying transformation | ||
| * rules. | ||
| */ | ||
| public final class LogicalTableScan extends TableScan { | ||
| // ~ Constructors ----------------------------------------------------------- | ||
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| /** | ||
| * Creates a LogicalTableScan. | ||
| * | ||
| * <p>Use {@link #create} unless you know what you're doing. | ||
| */ | ||
| public LogicalTableScan( | ||
| RelOptCluster cluster, RelTraitSet traitSet, List<RelHint> hints, RelOptTable table) { | ||
| super(cluster, traitSet, hints, table); | ||
| } | ||
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| @Deprecated // to be removed before 2.0 | ||
| public LogicalTableScan(RelOptCluster cluster, RelTraitSet traitSet, RelOptTable table) { | ||
| this(cluster, traitSet, ImmutableList.of(), table); | ||
| } | ||
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| @Deprecated // to be removed before 2.0 | ||
| public LogicalTableScan(RelOptCluster cluster, RelOptTable table) { | ||
| this(cluster, cluster.traitSetOf(Convention.NONE), ImmutableList.of(), table); | ||
| } | ||
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| /** Creates a LogicalTableScan by parsing serialized output. */ | ||
| public LogicalTableScan(RelInput input) { | ||
| super(input); | ||
| } | ||
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| @Override | ||
| public RelNode copy(RelTraitSet traitSet, List<RelNode> inputs) { | ||
| assert traitSet.containsIfApplicable(Convention.NONE); | ||
| assert inputs.isEmpty(); | ||
| return this; | ||
| } | ||
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| // BEGIN FLINK MODIFICATION | ||
| // {@link #explainTerms} method should consider hints due to CALCITE-4581. | ||
| // This file should be remove once CALCITE-4581 is fixed. | ||
| @Override | ||
| public RelWriter explainTerms(RelWriter pw) { | ||
| return super.explainTerms(pw).itemIf("hints", getHints(), !getHints().isEmpty()); | ||
| } | ||
| // END FLINK MODIFICATION | ||
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| /** | ||
| * Creates a LogicalTableScan. | ||
| * | ||
| * @param cluster Cluster | ||
| * @param relOptTable Table | ||
| * @param hints The hints | ||
| */ | ||
| public static LogicalTableScan create( | ||
| RelOptCluster cluster, final RelOptTable relOptTable, List<RelHint> hints) { | ||
| final Table table = relOptTable.unwrap(Table.class); | ||
| final RelTraitSet traitSet = | ||
| cluster.traitSetOf(Convention.NONE) | ||
| .replaceIfs( | ||
| RelCollationTraitDef.INSTANCE, | ||
| () -> { | ||
| if (table != null) { | ||
| return table.getStatistic().getCollations(); | ||
| } | ||
| return ImmutableList.of(); | ||
| }); | ||
| return new LogicalTableScan(cluster, traitSet, hints, relOptTable); | ||
| } | ||
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| @Override | ||
| public RelNode withHints(List<RelHint> hintList) { | ||
| return new LogicalTableScan(getCluster(), traitSet, hintList, table); | ||
| } | ||
| } |
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