Fix non-flat vector with nested VARIANT#694
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It appeared that with nested `VARIANT`/`JSON` a non-flat (constant) vector can be surfaced during conversion of a result set to Java types. This PR fixes that code path flattening the vector before processing. This is more like a band-aid - for long-term the support of `VARIANT` needs to be re-implemented on top of `DuckDBDataChunkReader` (see duckdb#682). Fixes: duckdb#692
This was referenced Jun 5, 2026
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This is a backport of the PR #694 to `v1.5-variegata` stable branch. It appeared that with nested `VARIANT`/`JSON` a non-flat (constant) vector can be surfaced during conversion of a result set to Java types. This PR fixes that code path flattening the vector before processing. This is more like a band-aid - for long-term the support of `VARIANT` needs to be re-implemented on top of `DuckDBDataChunkReader` (see #682). Fixes: #692
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It appeared that with nested
VARIANT/JSONa non-flat (constant) vector can be surfaced during conversion of a result set to Java types.This PR fixes that code path flattening the vector before processing.
This is more like a band-aid - for long-term the support of
VARIANTneeds to be re-implemented on top ofDuckDBDataChunkReader(see #682).Fixes: #692