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VarListColumnChunk::write
is expected to write a var list value to a given position inside the column chunk, and there is no enforcement of the order of given positions. For example,write
can take[10,20]
to pos 5,[1,2,8]
to pos 1, etc.However, the layout of var list column requires
offsets
to be sorted based on positions in the column chunk.This PR introduces an extra indices column chunk to handle the ordering difference. During
write
, an extra index is recorded intoindices
to track where the var list value is stored. Andfinalize
is called afterwrite
s are done, which re-append var list values according to their position in the column chunk.