com.hazelcast.org.apache.calcite.rel.metadata.RelMdMinRowCount Maven / Gradle / Ivy
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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 com.hazelcast.org.apache.calcite.rel.metadata;
import com.hazelcast.org.apache.calcite.adapter.enumerable.EnumerableLimit;
import com.hazelcast.org.apache.calcite.plan.volcano.RelSubset;
import com.hazelcast.org.apache.calcite.rel.RelNode;
import com.hazelcast.org.apache.calcite.rel.core.Aggregate;
import com.hazelcast.org.apache.calcite.rel.core.Calc;
import com.hazelcast.org.apache.calcite.rel.core.Exchange;
import com.hazelcast.org.apache.calcite.rel.core.Filter;
import com.hazelcast.org.apache.calcite.rel.core.Intersect;
import com.hazelcast.org.apache.calcite.rel.core.Join;
import com.hazelcast.org.apache.calcite.rel.core.Minus;
import com.hazelcast.org.apache.calcite.rel.core.Project;
import com.hazelcast.org.apache.calcite.rel.core.Sort;
import com.hazelcast.org.apache.calcite.rel.core.TableModify;
import com.hazelcast.org.apache.calcite.rel.core.TableScan;
import com.hazelcast.org.apache.calcite.rel.core.Union;
import com.hazelcast.org.apache.calcite.rel.core.Values;
import com.hazelcast.org.apache.calcite.rex.RexLiteral;
import com.hazelcast.org.apache.calcite.util.Bug;
import com.hazelcast.org.apache.calcite.util.Util;
import com.hazelcast.org.checkerframework.checker.nullness.qual.Nullable;
/**
* RelMdMinRowCount supplies a default implementation of
* {@link RelMetadataQuery#getMinRowCount} for the standard logical algebra.
*/
public class RelMdMinRowCount
implements MetadataHandler {
public static final RelMetadataProvider SOURCE =
ReflectiveRelMetadataProvider.reflectiveSource(
new RelMdMinRowCount(), BuiltInMetadata.MinRowCount.Handler.class);
//~ Methods ----------------------------------------------------------------
@Override public MetadataDef getDef() {
return BuiltInMetadata.MinRowCount.DEF;
}
public Double getMinRowCount(Union rel, RelMetadataQuery mq) {
double rowCount = 0.0;
for (RelNode input : rel.getInputs()) {
Double partialRowCount = mq.getMinRowCount(input);
if (partialRowCount != null) {
rowCount += partialRowCount;
}
}
if (rel.all) {
return rowCount;
} else {
return Math.min(rowCount, 1d);
}
}
public Double getMinRowCount(Intersect rel, RelMetadataQuery mq) {
return 0d; // no lower bound
}
public Double getMinRowCount(Minus rel, RelMetadataQuery mq) {
return 0d; // no lower bound
}
public Double getMinRowCount(Filter rel, RelMetadataQuery mq) {
return 0d; // no lower bound
}
public @Nullable Double getMinRowCount(Calc rel, RelMetadataQuery mq) {
if (rel.getProgram().getCondition() != null) {
// no lower bound
return 0d;
} else {
return mq.getMinRowCount(rel.getInput());
}
}
public @Nullable Double getMinRowCount(Project rel, RelMetadataQuery mq) {
return mq.getMinRowCount(rel.getInput());
}
public @Nullable Double getMinRowCount(Exchange rel, RelMetadataQuery mq) {
return mq.getMinRowCount(rel.getInput());
}
public @Nullable Double getMinRowCount(TableModify rel, RelMetadataQuery mq) {
return mq.getMinRowCount(rel.getInput());
}
public Double getMinRowCount(Sort rel, RelMetadataQuery mq) {
Double rowCount = mq.getMinRowCount(rel.getInput());
if (rowCount == null) {
rowCount = 0D;
}
final int offset = rel.offset instanceof RexLiteral ? RexLiteral.intValue(rel.offset) : 0;
rowCount = Math.max(rowCount - offset, 0D);
final double limit =
rel.fetch instanceof RexLiteral ? RexLiteral.intValue(rel.fetch) : rowCount;
return limit < rowCount ? limit : rowCount;
}
public Double getMinRowCount(EnumerableLimit rel, RelMetadataQuery mq) {
Double rowCount = mq.getMinRowCount(rel.getInput());
if (rowCount == null) {
rowCount = 0D;
}
final int offset = rel.offset instanceof RexLiteral ? RexLiteral.intValue(rel.offset) : 0;
rowCount = Math.max(rowCount - offset, 0D);
final double limit =
rel.fetch instanceof RexLiteral ? RexLiteral.intValue(rel.fetch) : rowCount;
return limit < rowCount ? limit : rowCount;
}
public Double getMinRowCount(Aggregate rel, RelMetadataQuery mq) {
if (rel.getGroupSet().isEmpty()) {
// Aggregate with no GROUP BY always returns 1 row (even on empty table).
return 1D;
}
final Double rowCount = mq.getMinRowCount(rel.getInput());
if (rowCount != null && rowCount >= 1D) {
return (double) rel.getGroupSets().size();
}
return 0D;
}
public Double getMinRowCount(Join rel, RelMetadataQuery mq) {
return 0D;
}
public Double getMinRowCount(TableScan rel, RelMetadataQuery mq) {
return 0D;
}
public Double getMinRowCount(Values values, RelMetadataQuery mq) {
// For Values, the minimum row count is the actual row count.
return (double) values.getTuples().size();
}
public Double getMinRowCount(RelSubset rel, RelMetadataQuery mq) {
// FIXME This is a short-term fix for [CALCITE-1018]. A complete
// solution will come with [CALCITE-1048].
Util.discard(Bug.CALCITE_1048_FIXED);
for (RelNode node : rel.getRels()) {
if (node instanceof Sort) {
Sort sort = (Sort) node;
if (sort.fetch != null) {
return (double) RexLiteral.intValue(sort.fetch);
}
}
}
return 0D;
}
// Catch-all rule when none of the others apply.
public @Nullable Double getMinRowCount(RelNode rel, RelMetadataQuery mq) {
return null;
}
}