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GH-421: Clarify schema field name uniqueness #610

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GH-421: Clarify schema field name uniqueness #610

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7 changes: 5 additions & 2 deletions src/main/thrift/parquet.thrift
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Original file line number Diff line number Diff line change
Expand Up @@ -520,7 +520,9 @@ union LogicalType {
* Represents an element inside a schema definition.
* - if it is a group (inner node) then type is undefined and num_children is defined
* - if it is a primitive type (leaf) then type is defined and num_children is undefined
* the nodes are listed in depth first traversal order.
* Field names are scoped by their containing group. The direct children of any
* group must have distinct names. Name comparison is case-sensitive.
* The nodes are listed in depth first traversal order.
*/
struct SchemaElement {
/** Data type for this field. Not set if the current element is a non-leaf node */
Expand Down Expand Up @@ -914,7 +916,8 @@ struct ColumnMetaData {
* whether we can decode those pages. **/
2: required list<Encoding> encodings

/** Path in schema **/
/** Path in schema, from the root's child to this column. The path must identify
* exactly one primitive field. **/
3: required list<string> path_in_schema

/** Compression codec **/
Expand Down