35860865834
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Ran 23 Sep 2026 12:33PM UTC

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Build # 35860865834

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push

github

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Giorgi

Commit Message

Refresh nested writers when a list of arrays grows

When a list outgrows its space in a batch, ListVectorDataWriter reserves
more room and refreshes its item writer's pointers. DuckDB's
Vector::Resize also moves the items of any ARRAY inside the list,
because an array's item buffer is always its capacity times the array
size. Only the direct item writer was refreshed, so for a list of arrays
the array's own item writer kept writing to the freed buffer.

Every array written after the list grew was lost, and in the test host
the writes into freed memory crashed the process, with or without NULLs.
Lists of lists were unaffected, because DuckDB leaves a list's items in
place when the outer list grows.

InitializeWriter is now virtual, and ListVectorDataWriter overrides it
to refresh its item writer too, so the refresh reaches every nested
level. For writers whose buffers did not move, it re-reads the same
pointer.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01KxGp85FzaVDRPo7eXVBFrf

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