[C++][Parquet] Make MemoryPool settable on ReaderProperties

Describe the enhancement requested

In arrow/dataset/file_parquet.cc, we have to set all Parquet ReaderProperties explicitly one by one from the source configuration, only because we cannot use the ReaderProperties copy constructor and afterwards set the MemoryPool to a different value:

arrow/cpp/src/arrow/dataset/file_parquet.cc

Lines 71 to 78 in 05c1a4b

    
           // Can't mutate pool after construction 
        
           parquet::ReaderProperties properties(pool); 
        
           if (parquet_scan_options->reader_properties->is_buffered_stream_enabled()) { 
        
             properties.enable_buffered_stream(); 
        
           } else { 
        
             properties.disable_buffered_stream(); 
        
           } 
        
           properties.set_buffer_size(parquet_scan_options->reader_properties->buffer_size());

We should make MemoryPool settable on ReaderProperties, and then simplify the dataset code to use the ReaderProperties copy constructor.

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C++, Parquet

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apacheGH-51264: [C++][Parquet] Make MemoryPool settable on ReaderProp…

GH-51264: [C++][Parquet] Make MemoryPool settable on ReaderProperties (…

Issue resolved by pull request 51269
#51269

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[C++][Parquet] Make MemoryPool settable on ReaderProperties #51264

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	// Can't mutate pool after construction
	parquet::ReaderProperties properties(pool);
	if (parquet_scan_options->reader_properties->is_buffered_stream_enabled()) {
	properties.enable_buffered_stream();
	} else {
	properties.disable_buffered_stream();
	}
	properties.set_buffer_size(parquet_scan_options->reader_properties->buffer_size());

[C++][Parquet] Make MemoryPool settable on ReaderProperties #51264

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Describe the enhancement requested

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Diveyam-Mishra commented on Sep 9, 2026

pitrou commented on Sep 14, 2026

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