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ParquetDateFromTimestampEncoder.h
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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 
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 ParquetTimestampEncoder<V, T, conversion_denominator> {
37  public:
40  const ColumnDescriptor* column_desciptor,
41  const parquet::ColumnDescriptor* parquet_column_descriptor)
42  : ParquetTimestampEncoder<V, T, conversion_denominator>(buffer,
43  column_desciptor,
44  parquet_column_descriptor) {
45  }
46 };
47 } // 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
ParquetDateFromTimestampEncoder(Data_Namespace::AbstractBuffer *buffer, const ColumnDescriptor *column_desciptor, const parquet::ColumnDescriptor *parquet_column_descriptor)