io.trino.sql.planner.LookupSymbolResolver Maven / Gradle / Ivy
/*
* 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 io.trino.sql.planner;
import com.google.common.collect.ImmutableMap;
import io.trino.spi.connector.ColumnHandle;
import io.trino.spi.predicate.NullableValue;
import java.util.Map;
import static java.util.Objects.requireNonNull;
public class LookupSymbolResolver
implements SymbolResolver
{
private final Map assignments;
private final Map bindings;
public LookupSymbolResolver(Map assignments, Map bindings)
{
requireNonNull(assignments, "assignments is null");
requireNonNull(bindings, "bindings is null");
this.assignments = ImmutableMap.copyOf(assignments);
this.bindings = ImmutableMap.copyOf(bindings);
}
@Override
public Object getValue(Symbol symbol)
{
ColumnHandle column = assignments.get(symbol);
if (column == null || !bindings.containsKey(column)) {
return symbol.toSymbolReference();
}
return bindings.get(column).getValue();
}
}