com.hazelcast.org.apache.calcite.sql.fun.SqlDefaultOperator Maven / Gradle / Ivy
/*
* 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.sql.fun;
import com.hazelcast.org.apache.calcite.sql.SqlCall;
import com.hazelcast.org.apache.calcite.sql.SqlKind;
import com.hazelcast.org.apache.calcite.sql.SqlSpecialOperator;
import com.hazelcast.org.apache.calcite.sql.SqlWriter;
import com.hazelcast.org.apache.calcite.sql.type.InferTypes;
import com.hazelcast.org.apache.calcite.sql.type.OperandTypes;
import com.hazelcast.org.apache.calcite.sql.type.ReturnTypes;
import com.hazelcast.org.apache.calcite.sql.type.SqlTypeName;
/**
* Operator that indicates that an argument to a function call is to take its
* default value.
*
* Not an expression; just a holder to represent syntax until the validator
* has chance to resolve arguments.
*/
class SqlDefaultOperator extends SqlSpecialOperator {
SqlDefaultOperator() {
super("DEFAULT", SqlKind.DEFAULT, 100, true,
ReturnTypes.explicit(SqlTypeName.ANY), InferTypes.RETURN_TYPE,
OperandTypes.NILADIC);
}
@Override public void unparse(SqlWriter writer, SqlCall call, int leftPrec,
int rightPrec) {
writer.keyword(getName());
}
}