C++ Apache Orc is not filtering data correctly

Question

I am posting a simple c++ Apache orc file reading program which:

Read data from ORC file.

Filter data based on the given string.

Sample Code:

#include <iostream>

#include <list>
#include <memory>
#include <chrono>

// Orc specific headers.
#include <orc/Reader.hh>
#include <orc/ColumnPrinter.hh>
#include <orc/Exceptions.hh>
#include <orc/OrcFile.hh>

int main(int argc, char const *argv[])
{
    auto begin = std::chrono::steady_clock::now();

    orc::RowReaderOptions m_RowReaderOpts;
    orc::ReaderOptions m_ReaderOpts;

    std::unique_ptr<orc::Reader> m_Reader;
    std::unique_ptr<orc::RowReader> m_RowReader;

    auto builder = orc::SearchArgumentFactory::newBuilder();
    std::string required_symbol("FILTERME");

    /// THIS LINE SHOULD FILTER DATA BASED ON COLUMNS.
    /// INSTEAD OF FILTERING IT TRAVERSE EACH ROW OF ORC FILE.
    builder->equals("column_name", orc::PredicateDataType::STRING, orc::Literal(required_symbol.c_str(), required_symbol.size()));

    std::string file_path("/orc/file/path.orc");
    
    m_Reader = orc::createReader(orc::readFile(file_path.c_str()), m_ReaderOpts);
    m_RowReader = m_Reader->createRowReader(m_RowReaderOpts);
    m_RowReaderOpts.searchArgument(builder->build());
    
    auto batch = m_RowReader->createRowBatch(5000);

    try
    {
        
        std::cout << builder->build()->toString() << std::endl;
        while(m_RowReader->next(*batch))
        {
            const auto &struct_batch = dynamic_cast<const orc::StructVectorBatch&>(*batch.get());
            /** DO CALCULATIONS */
        }
        
    }
    catch(const std::exception& e)
    {
        std::cerr << e.what() << '\n';
    }

    auto end = std::chrono::steady_clock::now();
    std::cout << "Total Time taken to read ORC file: " << std::chrono::duration_cast<std::chrono::milliseconds>(end - begin).count() << " ms.\n";

    return 0;
}

I tried searching on google for almost a week and tried to convert every possible java program into c++ to make my code works.
I tried to use the example in the STACKOVERFLOW LINK which has a similar issue but didn't work for me.

**Question:**
1. Am I wiring filtering code correctly. If yes then why it is not filtering data based on the given string.
2. Where can I find the C++ or 'relevant Java code' for row-level or strip-level filter.

Answer 1

Finally after trying multiple scenarios, I have resolved the above issue with ORC data filtering.
It was because of using the incorrect column number, I am not sure why there is a difference between the column id of the columns to fetch and columns to filter.
In above example I tried to filter data with column name and issue of filtering ORC with column name is still there. But unfortulately it is working fine with column number.

New Code:

#include <iostream>

#include <list>
#include <memory>
#include <chrono>

// Orc specific headers.
#include <orc/Reader.hh>
#include <orc/ColumnPrinter.hh>
#include <orc/Exceptions.hh>
#include <orc/OrcFile.hh>

int main(int argc, char const *argv[])
{
    auto begin = std::chrono::steady_clock::now();

    orc::RowReaderOptions m_RowReaderOpts;
    orc::ReaderOptions m_ReaderOpts;

    std::unique_ptr<orc::Reader> m_Reader;
    std::unique_ptr<orc::RowReader> m_RowReader;

    auto builder = orc::SearchArgumentFactory::newBuilder();
    std::string required_symbol("FILTERME");

    // <-- HERE COLUMN IDS ARE STARTING FROM 0-N. -->
    std::list<uint64_t> cols = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
    m_RowReaderOpts.include(cols);

    int column_id = 7; // IN cols ABOVE, THIS COLUMN_ID 7 IS ACTUALLY 6. WHICH MEANS COLUMN_ID TO FILTER COLUMN IS +1 OF COLUMN ID PROVIDED IN DATA FETCH.
    builder->equals(column_id, orc::PredicateDataType::STRING, orc::Literal(required_symbol.c_str(), required_symbol.size()));

    std::string file_path("/orc/file/path.orc");
    
    m_Reader = orc::createReader(orc::readFile(file_path.c_str()), m_ReaderOpts);
    m_RowReader = m_Reader->createRowReader(m_RowReaderOpts);
    m_RowReaderOpts.searchArgument(builder->build());
    
    auto batch = m_RowReader->createRowBatch(5000);

    try
    {
        
        std::cout << builder->build()->toString() << std::endl;
        while(m_RowReader->next(*batch))
        {
            const auto &struct_batch = dynamic_cast<const orc::StructVectorBatch&>(*batch.get());
            /** DO CALCULATIONS */
        }
        
    }
    catch(const std::exception& e)
    {
        std::cerr << e.what() << '\n';
    }

    auto end = std::chrono::steady_clock::now();
    std::cout << "Total Time taken to read ORC file: " << std::chrono::duration_cast<std::chrono::milliseconds>(end - begin).count() << " ms.\n";

    return 0;
}

As per my understanding while resolving above issue is, column ids for fetching data starts from 0-N and for filtering it is 1-N. This is why you should provide 1, when you require to filter data at column 0.