Refactor struct layout expression partitioning into dedicated module - #9106

Draft

joseph-isaacs wants to merge 10 commits into

claude/partitioning-structs-nullability-498zmg

Commits on Jul 31, 2026

fix: partition struct expressions over validity as well as fields
claude
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36fe75d
test: cover struct nullability end to end; address slots by index
claude
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1b9b9a5
test: project the nullable struct column unwrapped
claude
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aafeee5
test: pin the generic partitioner's behaviour before unifying it
claude
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4c661ca
test: pin row_idx partitioning before unifying it
claude
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0746f47
test: cover multi- and repeated-pushdown splits in the dict reader
claude
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251f002
refactor: extract a Partitioner trait behind the shared partitioner
claude
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a7ed4e5
refactor: fold the struct partitioner onto the shared implementation
claude
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c726ad5
refactor: fold row_idx onto the shared partitioner
claude
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9d9a90f
docs: fix an intra-doc link to slot_to_child
claude
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57b6668