Add FIXED_SIZE_LIST

LogicalTypes.md

@@ -255,6 +255,18 @@ The primitive type is a 2-byte fixed length binary.
 
 The sort order for `FLOAT16` is signed (with special handling of NANs and signed zeros); it uses the same [logic](https://github.com/apache/parquet-format#sort-order) as `FLOAT` and `DOUBLE`.
 
+### FIXED_SIZE_LIST
+
+The `FIXED_SIZE_LIST` annotation represents a fixed-size list of elements
+of a fixed-width data type. It must annotate an N-byte fixed length binary
+where N is the number of elements in the list times bit width of the element
+data type.
+
+The `fixed_len_byte_array` data is interpreted as a sequence of elements of
+the same fixed-width data type.
+
+The sort order used for `FIXED_SIZE_LIST` is undefined.
+
 ## Temporal Types
 
 ### DATE

src/main/thrift/parquet.thrift

@@ -282,13 +282,14 @@ struct Statistics {
 }
 
 /** Empty structs to use as logical type annotations */
-struct StringType {}  // allowed for BINARY, must be encoded with UTF-8
-struct UUIDType {}    // allowed for FIXED[16], must encoded raw UUID bytes
-struct MapType {}     // see LogicalTypes.md
-struct ListType {}    // see LogicalTypes.md
-struct EnumType {}    // allowed for BINARY, must be encoded with UTF-8
-struct DateType {}    // allowed for INT32
-struct Float16Type {} // allowed for FIXED[2], must encoded raw FLOAT16 bytes
+struct StringType {}        // allowed for BINARY, must be encoded with UTF-8
+struct UUIDType {}          // allowed for FIXED[16], must encoded raw UUID bytes
+struct MapType {}           // see LogicalTypes.md
+struct ListType {}          // see LogicalTypes.md
+struct EnumType {}          // allowed for BINARY, must be encoded with UTF-8
+struct DateType {}          // allowed for INT32
+struct Float16Type {}       // allowed for FIXED[2], must encoded raw FLOAT16 bytes
+struct FixedSizeListType {} // see LogicalTypes.md
 
 /**
  * Logical type to annotate a column that is always null.
@@ -397,12 +398,14 @@ union LogicalType {
   8:  TimestampType TIMESTAMP
 
   // 9: reserved for INTERVAL
-  10: IntType INTEGER         // use ConvertedType INT_* or UINT_*
-  11: NullType UNKNOWN        // no compatible ConvertedType
-  12: JsonType JSON           // use ConvertedType JSON
-  13: BsonType BSON           // use ConvertedType BSON
-  14: UUIDType UUID           // no compatible ConvertedType
-  15: Float16Type FLOAT16     // no compatible ConvertedType
+  10: IntType INTEGER                   // use ConvertedType INT_* or UINT_*
+  11: NullType UNKNOWN                  // no compatible ConvertedType
+  12: JsonType JSON                     // use ConvertedType JSON
+  13: BsonType BSON                     // use ConvertedType BSON
+  14: UUIDType UUID                     // no compatible ConvertedType
+  15: Float16Type FLOAT16               // no compatible ConvertedType
+  // 16: reserved for GEOMETRY
+  17: FixedSizeListType FIXED_SIZE_LIST // no compatible ConvertedType
 }
 
 /**