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| auto group_node = internal::checked_pointer_cast<::parquet::schema::GroupNode>(node); | ||
| for (int i = 0; i < group_node->field_count(); i++) { | ||
| if (HasFieldIds(group_node->field(i))) { | ||
| return true; | ||
| } | ||
| } |
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What does this means? Any leaf has field-id?
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Just simply check if any field (whether leaf or non-leaf) has field-id. This is in sync with the Java impl.
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I think we cannot blindly check if all fields have ids because it is valid to have some fields that do not have ids, especially when variant type is supported.
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I knew that for 3-levels complex type, fieldId might not exists, but here I don't fully understand the purpose, so any leaf has field-id means writer is field-id aware?
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I think Iceberg only supports three-level list encoding per the spec: https://iceberg.apache.org/spec/#parquet
Lists must use the 3-level representation.
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@Fokko @zeroshade Could you help review this? Thanks! |
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