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ExpressionExtractor.java
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ExpressionExtractor.java
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/*
* 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 com.facebook.presto.sql.planner;
import com.facebook.presto.spi.relation.RowExpression;
import com.facebook.presto.sql.planner.iterative.GroupReference;
import com.facebook.presto.sql.planner.iterative.Lookup;
import com.facebook.presto.sql.planner.plan.AggregationNode;
import com.facebook.presto.sql.planner.plan.ApplyNode;
import com.facebook.presto.sql.planner.plan.FilterNode;
import com.facebook.presto.sql.planner.plan.JoinNode;
import com.facebook.presto.sql.planner.plan.PlanNode;
import com.facebook.presto.sql.planner.plan.ProjectNode;
import com.facebook.presto.sql.planner.plan.ValuesNode;
import com.facebook.presto.sql.relational.OriginalExpressionUtils;
import com.google.common.collect.ImmutableList;
import java.util.List;
import static com.facebook.presto.sql.planner.iterative.Lookup.noLookup;
import static com.facebook.presto.sql.relational.OriginalExpressionUtils.castToRowExpression;
import static com.google.common.collect.ImmutableList.toImmutableList;
import static java.util.Objects.requireNonNull;
public class ExpressionExtractor
{
public static List<RowExpression> extractExpressions(PlanNode plan)
{
return extractExpressions(plan, noLookup());
}
public static List<RowExpression> extractExpressions(PlanNode plan, Lookup lookup)
{
requireNonNull(plan, "plan is null");
requireNonNull(lookup, "lookup is null");
ImmutableList.Builder<RowExpression> expressionsBuilder = ImmutableList.builder();
plan.accept(new Visitor(true, lookup), expressionsBuilder);
return expressionsBuilder.build();
}
public static List<RowExpression> extractExpressionsNonRecursive(PlanNode plan)
{
ImmutableList.Builder<RowExpression> expressionsBuilder = ImmutableList.builder();
plan.accept(new Visitor(false, noLookup()), expressionsBuilder);
return expressionsBuilder.build();
}
private ExpressionExtractor()
{
}
private static class Visitor
extends SimplePlanVisitor<ImmutableList.Builder<RowExpression>>
{
private final boolean recursive;
private final Lookup lookup;
Visitor(boolean recursive, Lookup lookup)
{
this.recursive = recursive;
this.lookup = requireNonNull(lookup, "lookup is null");
}
@Override
protected Void visitPlan(PlanNode node, ImmutableList.Builder<RowExpression> context)
{
if (recursive) {
return super.visitPlan(node, context);
}
return null;
}
@Override
public Void visitGroupReference(GroupReference node, ImmutableList.Builder<RowExpression> context)
{
return lookup.resolve(node).accept(this, context);
}
@Override
public Void visitAggregation(AggregationNode node, ImmutableList.Builder<RowExpression> context)
{
node.getAggregations().values()
.forEach(aggregation -> context.add(castToRowExpression(aggregation.getCall())));
return super.visitAggregation(node, context);
}
@Override
public Void visitFilter(FilterNode node, ImmutableList.Builder<RowExpression> context)
{
context.add(castToRowExpression(node.getPredicate()));
return super.visitFilter(node, context);
}
@Override
public Void visitProject(ProjectNode node, ImmutableList.Builder<RowExpression> context)
{
context.addAll(node.getAssignments().getExpressions().stream().map(OriginalExpressionUtils::castToRowExpression).collect(toImmutableList()));
return super.visitProject(node, context);
}
@Override
public Void visitJoin(JoinNode node, ImmutableList.Builder<RowExpression> context)
{
node.getFilter().map(OriginalExpressionUtils::castToRowExpression).ifPresent(context::add);
return super.visitJoin(node, context);
}
@Override
public Void visitValues(ValuesNode node, ImmutableList.Builder<RowExpression> context)
{
node.getRows().forEach(context::addAll);
return super.visitValues(node, context);
}
@Override
public Void visitApply(ApplyNode node, ImmutableList.Builder<RowExpression> context)
{
context.addAll(node.getSubqueryAssignments()
.getExpressions()
.stream()
.map(OriginalExpressionUtils::castToRowExpression)
.collect(toImmutableList()));
return super.visitApply(node, context);
}
}
}