FFI_RecordBatchStream was causing a memory leak#17190
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alamb merged 2 commits intoapache:mainfrom Aug 19, 2025
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…mpletion. This is a temporary work around for apache/datafusion#17190
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Thank you @timsaucer -- this makes sense to me
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| unsafe extern "C" fn release_fn_wrapper(provider: &mut FFI_RecordBatchStream) { | ||
| let private_data = |
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I double checked that the private_data is actually a RecordBatchStreamPrivateData that is created with the constructor
datafusion/datafusion/ffi/src/record_batch_stream.rs
Lines 80 to 84 in 327f8bc
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I also merged up from main |
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Co-authored-by: Andrew Lamb <andrew@nerdnetworks.org>
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Which issue does this PR close?
Rationale for this change
When using the foreign function interface, a
Box<RecordBatchStreamPrivateData>is created but it is never properly freed. This leads to a growth in memory over time as these are used.What changes are included in this PR?
Adds a
releasefunction to FFI_RecordBatchStream and implementsDrop.Are these changes tested?
Tested against
datafusion-pythonwhere it is easy to track memory growth and to implement FFI based table providers.Are there any user-facing changes?
None