io.trino.sql.planner.Symbol 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.fasterxml.jackson.databind.annotation.JsonSerialize;
import io.trino.spi.type.Type;
import io.trino.sql.ir.Expression;
import io.trino.sql.ir.Reference;
import static com.google.common.base.Preconditions.checkArgument;
import static java.util.Objects.requireNonNull;
@JsonSerialize(keyUsing = SymbolKeySerializer.class)
public record Symbol(Type type, String name)
{
public static Symbol from(Expression expression)
{
if (!(expression instanceof Reference symbol)) {
throw new IllegalArgumentException("Unexpected expression: " + expression);
}
return new Symbol(symbol.type(), symbol.name());
}
public Symbol
{
requireNonNull(name, "name is null");
checkArgument(!name.isEmpty(), "name is empty");
requireNonNull(type, "type is null");
}
public Reference toSymbolReference()
{
return new Reference(type, name);
}
@Override
public String toString()
{
return name + "::[" + type + "]";
}
}