com.hazelcast.org.apache.calcite.interpreter.Interpreters 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.runtime.ArrayBindable;
import com.hazelcast.org.checkerframework.checker.nullness.qual.Nullable;
/**
* Utilities relating to {@link com.hazelcast.org.apache.calcite.interpreter.Interpreter}
* and {@link com.hazelcast.org.apache.calcite.interpreter.InterpretableConvention}.
*/
public class Interpreters {
private Interpreters() {}
/** Creates a {@link com.hazelcast.org.apache.calcite.runtime.Bindable} that interprets a
* given relational expression. */
public static ArrayBindable bindable(final RelNode rel) {
if (rel instanceof ArrayBindable) {
// E.g. if rel instanceof BindableRel
return (ArrayBindable) rel;
}
return new ArrayBindable() {
@Override public Enumerable<@Nullable Object[]> bind(DataContext dataContext) {
return new Interpreter(dataContext, rel);
}
@Override public Class getElementType() {
return Object[].class;
}
};
}
}