com.hazelcast.org.apache.calcite.sql.fun.SqlRandFunction 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 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.SqlSyntax;
import com.hazelcast.org.apache.calcite.sql.type.OperandTypes;
import com.hazelcast.org.apache.calcite.sql.type.ReturnTypes;
/**
* The RAND function. There are two overloads:
*
*
* - RAND() returns a random double between 0 and 1
*
- RAND(seed) returns a random double between 0 and 1, initializing the
* random number generator with seed on first call
*
*/
public class SqlRandFunction extends SqlFunction {
//~ Constructors -----------------------------------------------------------
public SqlRandFunction() {
super("RAND",
SqlKind.OTHER_FUNCTION,
ReturnTypes.DOUBLE,
null,
OperandTypes.or(OperandTypes.NILADIC, OperandTypes.NUMERIC),
SqlFunctionCategory.NUMERIC);
}
//~ Methods ----------------------------------------------------------------
public SqlSyntax getSyntax() {
return SqlSyntax.FUNCTION;
}
// Plans referencing context variables should never be cached
public boolean isDynamicFunction() {
return true;
}
}