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ARROW-301: Add user field metadata to IPC schemas #154

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ARROW-301: Add user field metadata to IPC schemas #154

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14 changes: 14 additions & 0 deletions format/Message.fbs
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Original file line number Diff line number Diff line change
Expand Up @@ -124,6 +124,16 @@ table VectorLayout {
type: VectorType;
}


/// ----------------------------------------------------------------------
/// user defined key value pairs to add custom metadata to arrow
/// key namespacing is the responsibility of the user

table KeyValue {
key: string;
value: [ubyte];
}

/// ----------------------------------------------------------------------
/// A field represents a named column in a record / row batch or child of a
/// nested type.
Expand All @@ -146,6 +156,8 @@ table Field {
/// does not include children
/// each recordbatch will return instances of those Buffers.
layout: [ VectorLayout ];
// User-defined metadata
custom_metadata: [ KeyValue ];
}

/// ----------------------------------------------------------------------
Expand All @@ -164,6 +176,8 @@ table Schema {
endianness: Endianness=Little;

fields: [Field];
// User-defined metadata
custom_metadata: [ KeyValue ];
}

/// ----------------------------------------------------------------------
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