utility-functions.h

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// Copyright 2012 Cloudera Inc.
//
// 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.


#ifndef IMPALA_EXPRS_UTILITY_FUNCTIONS_H
#define IMPALA_EXPRS_UTILITY_FUNCTIONS_H

#include "udf/udf.h"

using namespace impala_udf;

namespace impala {

class Expr;
class OpcodeRegistry;
class TupleRow;

class UtilityFunctions {
 public:
  template <typename T> static BigIntVal FnvHash(FunctionContext* ctx, const T& input_val);
  static BigIntVal FnvHashString(FunctionContext* ctx, const StringVal& input_val);
  static BigIntVal FnvHashTimestamp(FunctionContext* ctx, const TimestampVal& input_val);
  static BigIntVal FnvHashDecimal(FunctionContext* ctx, const DecimalVal& input_val);

  static StringVal User(FunctionContext* ctx);

  static StringVal Version(FunctionContext* ctx);

  static IntVal Pid(FunctionContext* ctx);

  static BooleanVal Sleep(FunctionContext* ctx, const IntVal& milliseconds);

  static StringVal CurrentDatabase(FunctionContext* ctx);

  template <typename T> static StringVal TypeOf(FunctionContext* ctx, const T& input_val);
};

}

#endif