com.hazelcast.org.apache.calcite.sql.fun.SqlBaseContextVariable 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 com.hazelcast.com.liance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.com.hazelcast.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.SqlFunction;
import com.hazelcast.org.apache.calcite.sql.SqlFunctionCategory;
import com.hazelcast.org.apache.calcite.sql.SqlKind;
import com.hazelcast.org.apache.calcite.sql.SqlOperatorBinding;
import com.hazelcast.org.apache.calcite.sql.SqlSyntax;
import com.hazelcast.org.apache.calcite.sql.type.OperandTypes;
import com.hazelcast.org.apache.calcite.sql.type.SqlReturnTypeInference;
import com.hazelcast.org.apache.calcite.sql.validate.SqlMonotonicity;
/**
* Base class for functions such as "USER", "CURRENT_ROLE", and "CURRENT_PATH".
*/
public class SqlBaseContextVariable extends SqlFunction {
//~ Constructors -----------------------------------------------------------
/** Creates a SqlBaseContextVariable. */
protected SqlBaseContextVariable(String name,
SqlReturnTypeInference returnType, SqlFunctionCategory category) {
super(name, SqlKind.OTHER_FUNCTION, returnType, null, OperandTypes.NILADIC,
category);
}
//~ Methods ----------------------------------------------------------------
public SqlSyntax getSyntax() {
return SqlSyntax.FUNCTION_ID;
}
// All of the string constants are monotonic.
@Override public SqlMonotonicity getMonotonicity(SqlOperatorBinding call) {
return SqlMonotonicity.CONSTANT;
}
// Plans referencing context variables should never be cached
public boolean isDynamicFunction() {
return true;
}
}