ARROW-10791: [Rust] StreamReader, read_dictionary duplicating schema info #8820
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I had submitted this before but I think it got lost in a rebase somewhere. I think this is more correct and informative.
This simplifies the code in `read_dictionary` and `StreamReader`; the `ipc_schema` gets parsed and converted into a `Schema` that `StreamReader` also holds onto, so use the `Schema` to find which fields use dictionaries rather than keeping both around.
nevi-me
approved these changes
Dec 3, 2020
| } | ||
| DataType::Dictionary(key_type, value_type) => { | ||
| let dict_id = field.dict_id(); | ||
| let dict_id = field.dict_id().ok_or_else(|| { |
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I apologise, I do remember this change, but I'm not sure of what happened; I presume while I was rebasing.
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No worries! I remember I sent you a rebased PR to your branch that was... complicated... so I'm not surprised :) Thanks for the merge!
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The purpose of this PR is refactoring
read_dictionaryto only need one kind ofSchema, which lets us then remove thefind_dictionary_fieldfunction and theipc_schemafield onStreamReaderby adding a way to look up schema fields that use a particular dictionary by ID.I'm also resubmitting a change to the
dict_id/dict_is_orderedmethods onField; I had submitted this to @nevi-me to become part of #8200 but it looks like it got lost in a rebase or something? I think it's more correct to only return values if the fields have a dictionary as their datatype.