GH-1194: Preserve empty list offset buffers#1229
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What's Changed
Preserve the required one-entry offset buffer for empty
ListVectorandLargeListVectorinstances when setting value count and when splitting/transferring zero values. This keeps empty list vectors aligned with the Arrow offset-buffer invariant and avoids exposing buffers whose writer index exceeds capacity.Adds regression coverage for allocated, unallocated, split-and-transfer, and nested empty list vectors.
Closes #1194.
Tests:
mvn -pl vector -am -P=-error-prone -Dmaven.gitcommitid.skip=true -Dsurefire.failIfNoSpecifiedTests=false -Dtest=TestSplitAndTransfer,TestListVector,TestLargeListVector testmvn -P=-error-prone -Dmaven.gitcommitid.skip=true test