feat(list): push element projections through ListLayout via list_get_item - #9725
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radmirnovii wants to merge 3 commits into
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feat(list): push element projections through ListLayout via list_get_item#9725radmirnovii wants to merge 3 commits into
list_get_item#9725radmirnovii wants to merge 3 commits into
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`list_get_item(field, list)` projects one struct field out of every list element. The list layout reader pushes it into the elements child, so struct-shredded elements skip unprojected fields' segments. Signed-off-by: rad <radmirnovii@gmail.com>
`list_get_item` chains descend nested lists, and the list layout reader pushes the whole chain into the elements child one level at a time. Signed-off-by: rad <radmirnovii@gmail.com>
Signed-off-by: rad <radmirnovii@gmail.com>
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We are in the process of adding higher order functions that will remove all the extra work without needing many new functions |
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If you are interested in contributing to vortex please join the channel and we can chat further! |
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Closes #9724.
ListGetItem(vortex.list.get_item): projects one struct field out of every listelement, over List/ListView/FixedSizeList and nested lists.
ListLayoutreader detects alist_get_itemchain overroot(), pushes the equivalentelement projection into the elements child, and rewrites the outer expression against the
narrowed list. Other expression shapes keep the existing read.
filter_evaluationshares the path.Tests: segment-count tests prove unprojected fields are never requested at one and two
nesting levels; results round-trip against in-memory evaluation across ranges, masks, nullability.
Scope: one leaf path per expression (two different fields in one expression fall back to the
full read); IO skipping needs files written with
ListLayoutStrategy::with_elements(StructStrategy),the default writer is unchanged.
Follow-ups: multi-field projection, Python/FFI/DuckDB/DataFusion exposure.
AI assistance: implemented with Claude Code; design, review and testing by me.