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IgniteHashIndexSpool.java
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IgniteHashIndexSpool.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.
*/
package org.apache.ignite.internal.sql.engine.rel;
import static org.apache.ignite.internal.util.CollectionUtils.nullOrEmpty;
import java.util.List;
import org.apache.calcite.plan.RelOptCluster;
import org.apache.calcite.plan.RelOptCost;
import org.apache.calcite.plan.RelOptPlanner;
import org.apache.calcite.plan.RelTraitSet;
import org.apache.calcite.rel.RelInput;
import org.apache.calcite.rel.RelNode;
import org.apache.calcite.rel.RelWriter;
import org.apache.calcite.rel.core.Spool;
import org.apache.calcite.rel.metadata.RelMetadataQuery;
import org.apache.calcite.rex.RexNode;
import org.apache.calcite.util.ImmutableBitSet;
import org.apache.ignite.internal.sql.engine.metadata.cost.IgniteCost;
import org.apache.ignite.internal.sql.engine.metadata.cost.IgniteCostFactory;
import org.apache.ignite.internal.sql.engine.util.RexUtils;
/**
* Relational operator that returns the hashed contents of a table and allow to lookup rows by specified keys.
*/
public class IgniteHashIndexSpool extends AbstractIgniteSpool {
/** Search row. */
private final List<RexNode> searchRow;
/** Keys (number of the columns at the input row) to build hash index. */
private final ImmutableBitSet keys;
/** Condition (used to calculate selectivity). */
private final RexNode cond;
/** Allow NULL values. */
private final boolean allowNulls;
/**
* Constructor.
* TODO Documentation https://issues.apache.org/jira/browse/IGNITE-15859
*/
public IgniteHashIndexSpool(
RelOptCluster cluster,
RelTraitSet traits,
RelNode input,
List<RexNode> searchRow,
RexNode cond,
boolean allowNulls
) {
super(cluster, traits, Type.LAZY, input);
assert !nullOrEmpty(searchRow);
this.searchRow = searchRow;
this.cond = cond;
this.allowNulls = allowNulls;
keys = ImmutableBitSet.of(RexUtils.notNullKeys(searchRow));
}
/**
* Constructor used for deserialization.
*
* @param input Serialized representation.
*/
public IgniteHashIndexSpool(RelInput input) {
this(input.getCluster(),
input.getTraitSet().replace(IgniteConvention.INSTANCE),
input.getInputs().get(0),
input.getExpressionList("searchRow"),
input.getExpression("condition"),
input.getBoolean("allowNulls", false)
);
}
/** {@inheritDoc} */
@Override
public <T> T accept(IgniteRelVisitor<T> visitor) {
return visitor.visit(this);
}
@Override
public IgniteRel clone(RelOptCluster cluster, List<IgniteRel> inputs) {
return new IgniteHashIndexSpool(cluster, getTraitSet(), inputs.get(0), searchRow, cond, allowNulls);
}
/** {@inheritDoc} */
@Override
protected Spool copy(RelTraitSet traitSet, RelNode input, Type readType, Type writeType) {
return new IgniteHashIndexSpool(getCluster(), traitSet, input, searchRow, cond, allowNulls);
}
/** {@inheritDoc} */
@Override
public boolean isEnforcer() {
return true;
}
@Override
public RelWriter explainTerms(RelWriter pw) {
RelWriter writer = super.explainTerms(pw);
return writer
.item("searchRow", searchRow)
.item("condition", cond)
.item("allowNulls", allowNulls);
}
/** {@inheritDoc} */
@Override
public RelOptCost computeSelfCost(RelOptPlanner planner, RelMetadataQuery mq) {
double rowCnt = mq.getRowCount(getInput());
double bytesPerRow = getRowType().getFieldCount() * IgniteCost.AVERAGE_FIELD_SIZE;
double totalBytes = rowCnt * bytesPerRow;
double cpuCost = IgniteCost.HASH_LOOKUP_COST;
IgniteCostFactory costFactory = (IgniteCostFactory) planner.getCostFactory();
return costFactory.makeCost(rowCnt, cpuCost, 0, totalBytes, 0);
}
/** {@inheritDoc} */
@Override
public double estimateRowCount(RelMetadataQuery mq) {
return mq.getRowCount(getInput()) * mq.getSelectivity(this, null);
}
/**
* Get search row.
* TODO Documentation https://issues.apache.org/jira/browse/IGNITE-15859
*/
public List<RexNode> searchRow() {
return searchRow;
}
/**
* Get keys.
* TODO Documentation https://issues.apache.org/jira/browse/IGNITE-15859
*/
public ImmutableBitSet keys() {
return keys;
}
/**
* Get condition.
* TODO Documentation https://issues.apache.org/jira/browse/IGNITE-15859
*/
public RexNode condition() {
return cond;
}
/** Allow {@code null} comparison as equal, use in case of NOT DISTINCT FROM syntax. */
public boolean allowNulls() {
return allowNulls;
}
}