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ParquetTimeEncoder.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
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8  * http://www.apache.org/licenses/LICENSE-2.0
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13  * See the License for the specific language governing permissions and
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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 // NullType - type of encoded null
30 //
31 // The `conversion_denominator` template is used instead of a class member to
32 // specify it at compile-time versus run-time. In testing this has a major
33 // impact on the runtime of the conversion performed by this encoder since the
34 // compiler can significantly optimize if this is known at compile time.
35 template <typename V, typename T, T conversion_denominator, typename NullType = V>
36 class ParquetTimeEncoder : public TypedParquetInPlaceEncoder<V, T, NullType> {
37  public:
39  const ColumnDescriptor* column_desciptor,
40  const parquet::ColumnDescriptor* parquet_column_descriptor)
41  : TypedParquetInPlaceEncoder<V, T, NullType>(buffer,
42  column_desciptor,
43  parquet_column_descriptor) {
44  CHECK(parquet_column_descriptor->logical_type()->is_time());
45  }
46 
47  void encodeAndCopy(const int8_t* parquet_data_bytes,
48  int8_t* omnisci_data_bytes) override {
49  const auto& parquet_data_value = reinterpret_cast<const T*>(parquet_data_bytes)[0];
50  auto& omnisci_data_value = reinterpret_cast<V*>(omnisci_data_bytes)[0];
51  omnisci_data_value = parquet_data_value / conversion_denominator;
52  }
53 };
54 
55 } // namespace foreign_storage
void encodeAndCopy(const int8_t *parquet_data_bytes, int8_t *omnisci_data_bytes) override
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
#define CHECK(condition)
Definition: Logger.h:209
ParquetTimeEncoder(Data_Namespace::AbstractBuffer *buffer, const ColumnDescriptor *column_desciptor, const parquet::ColumnDescriptor *parquet_column_descriptor)