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fix: ebpps_sketch::merge(const&) called an unqualified swap - #557
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The const& overload swapped with swap(*this, sk_copy), which only compiles when argument-dependent lookup finds a swap through the template arguments. With an allocator from an application's namespace it fails to compile. Call std::swap, as merge(&&) already does. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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When
ebpps_sketch::merge(const ebpps_sketch&)merges a heavier sketch, it swaps withswap(*this, sk_copy), unqualified. That only compiles when argument-dependent lookup finds aswapthrough the template arguments, as it does forstd::allocator. With an allocator from an application's namespace it fails:merge(ebpps_sketch&&)already callsstd::swap, so this does the same. I checked the other headers and found no other unqualifiedswapcalls.Test
Added
ebpps merge heavier sketch by const reference with an application allocatortoebpps_allocation_test.cpp. It uses an allocator declared outside thedatasketchesnamespace. Without the fix it doesn't compile; with it, all EBPPS tests pass (14 test cases).We found this in the DuckDB DataSketches extension, which builds its sketches with its own allocator. Until now it worked around this by copying the sketch and merging through
merge(&&).🤖 Generated with Claude Code