com.hazelcast.org.apache.calcite.interpreter.Compiler 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.
*/
package com.hazelcast.org.apache.calcite.interpreter;
import com.hazelcast.org.apache.calcite.DataContext;
import com.hazelcast.org.apache.calcite.linq4j.Enumerable;
import com.hazelcast.org.apache.calcite.rel.RelNode;
import com.hazelcast.org.apache.calcite.rel.type.RelDataType;
import com.hazelcast.org.apache.calcite.rex.RexNode;
import com.hazelcast.org.checkerframework.checker.nullness.qual.Nullable;
import java.util.List;
/**
* Context while converting a tree of {@link RelNode} to a program
* that can be run by an {@link Interpreter}.
*/
public interface Compiler {
/** Compiles an expression to an executable form. */
Scalar compile(List nodes, @Nullable RelDataType inputRowType);
RelDataType combinedRowType(List inputs);
Source source(RelNode rel, int ordinal);
/**
* Creates a Sink for a relational expression to write into.
*
* This method is generally called from the constructor of a {@link Node}.
* But a constructor could instead call
* {@link #enumerable(RelNode, Enumerable)}.
*
* @param rel Relational expression
* @return Sink
*/
Sink sink(RelNode rel);
/** Tells the interpreter that a given relational expression wishes to
* give its output as an enumerable.
*
*
This is as opposed to the norm, where a relational expression calls
* {@link #sink(RelNode)}, then its {@link Node#run()} method writes into that
* sink.
*
* @param rel Relational expression
* @param rowEnumerable Contents of relational expression
*/
void enumerable(RelNode rel, Enumerable rowEnumerable);
DataContext getDataContext();
Context createContext();
}