org.apache.flink.table.planner.plan.utils.RelDescriptionWriterImpl Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of flink-table-planner-blink_2.11 Show documentation
Show all versions of flink-table-planner-blink_2.11 Show documentation
This module bridges Table/SQL API and runtime. It contains
all resources that are required during pre-flight and runtime
phase. The content of this module is work-in-progress. It will
replace flink-table-planner once it is stable. See FLINK-11439
and FLIP-32 for more details.
/*
* 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.flink.table.planner.plan.utils;
import org.apache.flink.table.planner.plan.nodes.FlinkRelNode;
import org.apache.flink.shaded.guava18.com.google.common.collect.ImmutableList;
import org.apache.calcite.rel.RelNode;
import org.apache.calcite.rel.RelWriter;
import org.apache.calcite.sql.SqlExplainLevel;
import org.apache.calcite.util.Pair;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.List;
/**
* Converts an {@link RelNode} to string with only the information from the RelNode itself without
* the information from its inputs. This is mainly used to generate {@link
* FlinkRelNode#getRelDetailedDescription()}.
*/
public class RelDescriptionWriterImpl implements RelWriter {
/**
* all the supported prefixes of RelNode class name (i.e. all the implementation of {@link
* FlinkRelNode}).
*/
private static final String[] REL_TYPE_NAME_PREFIXES = {
"StreamExec", "BatchExec", "BatchPhysical", "StreamPhysical", "FlinkLogical"
};
private final PrintWriter pw;
private final List> values = new ArrayList<>();
public RelDescriptionWriterImpl(PrintWriter pw) {
this.pw = pw;
}
@Override
public void explain(RelNode rel, List> valueList) {
StringBuilder s = new StringBuilder();
s.append(getNodeTypeName(rel));
int j = 0;
for (Pair value : valueList) {
if (j++ == 0) {
s.append("(");
} else {
s.append(", ");
}
s.append(value.getKey()).append("=[").append(value.getValue()).append("]");
}
if (j > 0) {
s.append(")");
}
pw.print(s.toString());
}
@Override
public SqlExplainLevel getDetailLevel() {
return SqlExplainLevel.EXPPLAN_ATTRIBUTES;
}
@Override
public RelWriter input(String term, RelNode input) {
// input nodes do not need to be displayed
return this;
}
@Override
public RelWriter item(String term, Object value) {
values.add(Pair.of(term, value));
return this;
}
@Override
public RelWriter done(RelNode node) {
final List> valuesCopy = ImmutableList.copyOf(values);
values.clear();
explain(node, valuesCopy);
pw.flush();
return this;
}
private String getNodeTypeName(RelNode rel) {
String typeName = rel.getRelTypeName();
for (String prefix : REL_TYPE_NAME_PREFIXES) {
if (typeName.startsWith(prefix)) {
return typeName.substring(prefix.length());
}
}
throw new IllegalStateException("Unsupported RelNode class name '" + typeName + "'");
}
}