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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 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.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 ---------------------------------------------------------------- @Override public SqlSyntax getSyntax() { return SqlSyntax.FUNCTION; } // Plans referencing context variables should never be cached @Override public boolean isDynamicFunction() { return true; } }




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