feat: parse List, ListView, LargeList, LargeListView, FixedSizeList
#8649
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dqkqd
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nullability and field for DataType::ListList, ListView, LargeList, LargeListView, FixedSizeList
dqkqd
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Oct 18, 2025
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| "nullable" => Token::Nullable, | ||
| "field" => Token::Field, | ||
| "x" => Token::X, |
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I cannot find a better name for x.
Using Time seems confuse with time related data types.
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Which issue does this PR close?
parse_data_typeforList,ListView,LargeList,LargeListView,FixedSizeList,Union,Map,RunEndCoded. #8648.This PR only implements for list types to make review easier.
Rationale for this change
The format for
DataType::Listincludes:List(Int64): list not nullable.List(nullable Int64): list nullable.List(nullable Int64, field: 'foo'): list nullable with field.List(nullable Int64, metadata: {"foo1": "value1"}): list with metadata.(... The list goes on for
ListView,LargeList,LargeListView,FixedSizeList)parse_data_typecannot (or incorrectly) work on those data types listed above.What changes are included in this PR?
Token::...to support newDisplayformat for list types introduced in ImproveDisplayforDataType#8351(e.g.
FixedSizeList(5 x nullable Int64, field: 'foo').fn nullableto check whether nested data type is nullable.parse_single_quoted_stringandparse_list_field_nameto handlefield: 'foo'.Are these changes tested?
Yes. Added round trip tests.
Are there any user-facing changes?
Yes. This is related to #8351