OmniSciDB  bf83d84833
 All Classes Namespaces Files Functions Variables Typedefs Enumerations Enumerator Friends Macros Pages
ParquetTimeEncoder.h
Go to the documentation of this file.
1 /*
2  * Copyright 2020 OmniSci, Inc.
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  * http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 #pragma once
18 
19 #include "ParquetInPlaceEncoder.h"
20 
21 namespace foreign_storage {
22 
23 // The following semantics apply to the templated types below.
24 //
25 // V - type of omnisci data
26 // T - physical type of parquet data
27 // conversion_denominator - the denominator constant used in converting parquet to omnisci
28 // data
29 //
30 // The `conversion_denominator` template is used instead of a class member to
31 // specify it at compile-time versus run-time. In testing this has a major
32 // impact on the runtime of the conversion performed by this encoder since the
33 // compiler can significantly optimize if this is known at compile time.
34 template <typename V, typename T, T conversion_denominator>
36  public:
38  const ColumnDescriptor* column_desciptor,
39  const parquet::ColumnDescriptor* parquet_column_descriptor)
40  : TypedParquetInPlaceEncoder<V, T>(buffer,
41  column_desciptor,
42  parquet_column_descriptor) {
43  CHECK(parquet_column_descriptor->logical_type()->is_time());
44  }
45 
46  void encodeAndCopy(const int8_t* parquet_data_bytes,
47  int8_t* omnisci_data_bytes) override {
48  const auto& parquet_data_value = reinterpret_cast<const T*>(parquet_data_bytes)[0];
49  auto& omnisci_data_value = reinterpret_cast<V*>(omnisci_data_bytes)[0];
50  omnisci_data_value = parquet_data_value / conversion_denominator;
51  }
52 };
53 
54 } // namespace foreign_storage
An AbstractBuffer is a unit of data management for a data manager.
specifies the content in-memory of a row in the column metadata table
void encodeAndCopy(const int8_t *parquet_data_bytes, int8_t *omnisci_data_bytes) override
#define CHECK(condition)
Definition: Logger.h:197
ParquetTimeEncoder(Data_Namespace::AbstractBuffer *buffer, const ColumnDescriptor *column_desciptor, const parquet::ColumnDescriptor *parquet_column_descriptor)