Add file with an FLBA(12) TIMESTAMP column

data/README.md

@@ -65,6 +65,7 @@
 | binary_truncated_min_max.parquet | A file containing six columns with exact, fully-truncated and partially-truncated max and min statistics and with the expected is_{min/max}_value_exact.  (see [note](Binary-truncated-min-and-max-statistics)).|
 | json.parquet | A single optional BYTE_ARRAY column annotated with the JSON logical type (also carries the legacy converted type JSON). Four rows: `{"a":1}`, `{"a":1,"b":null}` (null field value inside a non-null document), `[1,null,3]` (null element inside an array), and a NULL row. See [note](#json-and-bson-logical-types) below. |
 | bson.parquet | A single optional BYTE_ARRAY column annotated with the BSON logical type (also carries the legacy converted type BSON). Three rows: BSON `{"a":1}`, `{"a":1,"b":null}` (null field value inside a non-null document), and a NULL row. See [note](#json-and-bson-logical-types) below. |
+| flba12_timestamp.parquet | Three `FIXED_LEN_BYTE_ARRAY(12)` columns annotated with `TIMESTAMP`. See [flba12_timestamp.md](flba12_timestamp.md) for details. |
 
 TODO: Document what each file is in the table above.
 

data/flba12_timestamp.md

@@ -0,0 +1,48 @@
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+
+# `flba12_timestamp.parquet`
+
+Three columns with physical type `FIXED_LEN_BYTE_ARRAY(12)` and logical type `TIMESTAMP`.
+
+## Schema
+
+```
+message flba12_timestamp {
+  optional fixed_len_byte_array(12) timestamp_millis (TIMESTAMP(MILLIS,true));
+  optional fixed_len_byte_array(12) timestamp_micros (TIMESTAMP(MICROS,true));
+  optional fixed_len_byte_array(12) timestamp_nanos  (TIMESTAMP(NANOS,true));
+}
+```
+
+All columns use `TYPE_DEFINED_ORDER`. For the `timestamp_nanos` column, two out of the six rows
+require more than 64 bits to represent.
+
+## Values
+
+The same six timestamp values appear in every column, only the unit scale differs.
+
+| Row | Instant (UTC)             | Note                                        |
+|-----|---------------------------|---------------------------------------------|
+| 0   | 1970-01-01T00:00:00Z      | Epoch — all-zero bytes                      |
+| 1   | 1970-01-01T00:00:01Z      | Small positive                              |
+| 2   | 1969-12-31T23:59:59Z      | Small negative — exercises two's-complement |
+| 3   | 2262-04-11T23:47:16Z      | Near INT64-nanos max (epochSecond = 9 223 372 036) |
+| 4   | 9999-12-31T23:59:59Z      | Far future — NANOS exceeds INT64            |
+| 5   | 0001-01-01T00:00:00Z      | Far past — NANOS is below INT64 minimum     |