Write to Delta Lake

pyproject.toml

@@ -12,6 +12,7 @@ dynamic = ["version", "description"]
 requires-python = ">=3.8"
 dependencies = [
     "ciso8601",
+    "deltalake",
     "geopandas",
     "packaging",
     "pandas",

stac_geoparquet/arrow/_api.py

@@ -1,6 +1,8 @@
+from __future__ import annotations
+
 import os
 from pathlib import Path
-from typing import Any, Dict, Iterable, Iterator, Optional, Union
+from typing import Any, Iterable, Iterator
 
 import pyarrow as pa
 
@@ -11,10 +13,10 @@
 
 
 def parse_stac_items_to_arrow(
-    items: Iterable[Dict[str, Any]],
+    items: Iterable[dict[str, Any]],
     *,
     chunk_size: int = 8192,
-    schema: Optional[Union[pa.Schema, InferredSchema]] = None,
+    schema: pa.Schema | InferredSchema | None = None,
 ) -> Iterable[pa.RecordBatch]:
     """Parse a collection of STAC Items to an iterable of :class:`pyarrow.RecordBatch`.
 
@@ -51,11 +53,11 @@ def parse_stac_items_to_arrow(
 
 
 def parse_stac_ndjson_to_arrow(
-    path: Union[str, Path, Iterable[Union[str, Path]]],
+    path: str | Path | Iterable[str | Path],
     *,
     chunk_size: int = 65536,
-    schema: Optional[pa.Schema] = None,
-    limit: Optional[int] = None,
+    schema: pa.Schema | None = None,
+    limit: int | None = None,
 ) -> Iterator[pa.RecordBatch]:
     """
     Convert one or more newline-delimited JSON STAC files to a generator of Arrow
@@ -83,6 +85,7 @@ def parse_stac_ndjson_to_arrow(
     if schema is None:
         inferred_schema = InferredSchema()
         inferred_schema.update_from_json(path, chunk_size=chunk_size, limit=limit)
+        inferred_schema.manual_updates()
         yield from parse_stac_ndjson_to_arrow(
             path, chunk_size=chunk_size, schema=inferred_schema
         )
@@ -103,7 +106,7 @@ def stac_table_to_items(table: pa.Table) -> Iterable[dict]:
 
 
 def stac_table_to_ndjson(
-    table: pa.Table, dest: Union[str, Path, os.PathLike[bytes]]
+    table: pa.Table, dest: str | Path | os.PathLike[bytes]
 ) -> None:
     """Write a STAC Table to a newline-delimited JSON file."""
     for batch in table.to_batches():
@@ -112,7 +115,7 @@ def stac_table_to_ndjson(
 
 
 def stac_items_to_arrow(
-    items: Iterable[Dict[str, Any]], *, schema: Optional[pa.Schema] = None
+    items: Iterable[dict[str, Any]], *, schema: pa.Schema | None = None
 ) -> pa.RecordBatch:
     """Convert dicts representing STAC Items to Arrow
 

stac_geoparquet/arrow/_delta_lake.py

@@ -0,0 +1,34 @@
+from __future__ import annotations
+
+import itertools
+from pathlib import Path
+from typing import TYPE_CHECKING, Any, Iterable
+
+import pyarrow as pa
+from deltalake import write_deltalake
+
+from stac_geoparquet.arrow._api import parse_stac_ndjson_to_arrow
+from stac_geoparquet.arrow._to_parquet import create_geoparquet_metadata
+
+if TYPE_CHECKING:
+    from deltalake import DeltaTable
+
+
+def parse_stac_ndjson_to_delta_lake(
+    input_path: str | Path | Iterable[str | Path],
+    table_or_uri: str | Path | DeltaTable,
+    *,
+    chunk_size: int = 65536,
+    schema: pa.Schema | None = None,
+    limit: int | None = None,
+    **kwargs: Any,
+) -> None:
+    batches_iter = parse_stac_ndjson_to_arrow(
+        input_path, chunk_size=chunk_size, schema=schema, limit=limit
+    )
+    first_batch = next(batches_iter)
+    schema = first_batch.schema.with_metadata(
+        create_geoparquet_metadata(pa.Table.from_batches([first_batch]))
+    )
+    combined_iter = itertools.chain([first_batch], batches_iter)
+    write_deltalake(table_or_uri, combined_iter, schema=schema, engine="rust", **kwargs)

stac_geoparquet/arrow/_schema/models.py

@@ -1,5 +1,7 @@
+from __future__ import annotations
+
 from pathlib import Path
-from typing import Any, Dict, Iterable, Optional, Sequence, Union
+from typing import Any, Iterable, Sequence
 
 import pyarrow as pa
 
@@ -27,10 +29,10 @@ def __init__(self) -> None:
 
     def update_from_json(
         self,
-        path: Union[str, Path, Iterable[Union[str, Path]]],
+        path: str | Path | Iterable[str | Path],
         *,
         chunk_size: int = 65536,
-        limit: Optional[int] = None,
+        limit: int | None = None,
     ) -> None:
         """
         Update this inferred schema from one or more newline-delimited JSON STAC files.
@@ -45,11 +47,57 @@ def update_from_json(
         for batch in read_json_chunked(path, chunk_size=chunk_size, limit=limit):
             self.update_from_items(batch)
 
-    def update_from_items(self, items: Sequence[Dict[str, Any]]) -> None:
+    def update_from_items(self, items: Sequence[dict[str, Any]]) -> None:
         """Update this inferred schema from a sequence of STAC Items."""
         self.count += len(items)
         current_schema = StacJsonBatch.from_dicts(items, schema=None).inner.schema
         new_schema = pa.unify_schemas(
             [self.inner, current_schema], promote_options="permissive"
         )
         self.inner = new_schema
+
+    def manual_updates(self) -> None:
+        schema = self.inner
+        properties_field = schema.field("properties")
+        properties_schema = pa.schema(properties_field.type)
+
+        # The datetime column can be inferred as `null` in the case of a Collection with
+        # start_datetime and end_datetime. But `null` is incompatible with Delta Lake,
+        # so we coerce to a Timestamp type.
+        if pa.types.is_null(properties_schema.field("datetime").type):
+            field_idx = properties_schema.get_field_index("datetime")
+            properties_schema = properties_schema.set(
+                field_idx,
+                properties_schema.field(field_idx).with_type(
+                    pa.timestamp("us", tz="UTC")
+                ),
+            )
+
+        if "proj:epsg" in properties_schema.names and pa.types.is_null(
+            properties_schema.field("proj:epsg").type
+        ):
+            field_idx = properties_schema.get_field_index("proj:epsg")
+            properties_schema = properties_schema.set(
+                field_idx,
+                properties_schema.field(field_idx).with_type(pa.int64()),
+            )
+
+        if "proj:wkt2" in properties_schema.names and pa.types.is_null(
+            properties_schema.field("proj:wkt2").type
+        ):
+            field_idx = properties_schema.get_field_index("proj:wkt2")
+            properties_schema = properties_schema.set(
+                field_idx,
+                properties_schema.field(field_idx).with_type(pa.string()),
+            )
+
+        # Note: proj:projjson can also be null, but we don't have a type we can cast
+        # that to.
+
+        properties_idx = schema.get_field_index("properties")
+        updated_schema = schema.set(
+            properties_idx,
+            properties_field.with_type(pa.struct(properties_schema)),
+        )
+
+        self.inner = updated_schema

stac_geoparquet/arrow/_to_parquet.py

@@ -1,6 +1,8 @@
+from __future__ import annotations
+
 import json
 from pathlib import Path
-from typing import Any, Dict, Iterable, Optional, Union
+from typing import Any, Iterable
 
 import pyarrow as pa
 import pyarrow.parquet as pq
@@ -11,11 +13,12 @@
 
 
 def parse_stac_ndjson_to_parquet(
-    input_path: Union[str, Path, Iterable[Union[str, Path]]],
-    output_path: Union[str, Path],
+    input_path: str | Path | Iterable[str | Path],
+    output_path: str | Path,
     *,
     chunk_size: int = 65536,
-    schema: Optional[Union[pa.Schema, InferredSchema]] = None,
+    schema: pa.Schema | InferredSchema | None = None,
+    limit: int | None = None,
     **kwargs: Any,
 ) -> None:
     """Convert one or more newline-delimited JSON STAC files to GeoParquet
@@ -32,11 +35,11 @@ def parse_stac_ndjson_to_parquet(
     """
 
     batches_iter = parse_stac_ndjson_to_arrow(
-        input_path, chunk_size=chunk_size, schema=schema
+        input_path, chunk_size=chunk_size, schema=schema, limit=limit
     )
     first_batch = next(batches_iter)
     schema = first_batch.schema.with_metadata(
-        _create_geoparquet_metadata(pa.Table.from_batches([first_batch]))
+        create_geoparquet_metadata(pa.Table.from_batches([first_batch]))
     )
     with pq.ParquetWriter(output_path, schema, **kwargs) as writer:
         writer.write_batch(first_batch)
@@ -54,13 +57,13 @@ def to_parquet(table: pa.Table, where: Any, **kwargs: Any) -> None:
         where: The destination for saving.
     """
     metadata = table.schema.metadata or {}
-    metadata.update(_create_geoparquet_metadata(table))
+    metadata.update(create_geoparquet_metadata(table))
     table = table.replace_schema_metadata(metadata)
 
     pq.write_table(table, where, **kwargs)
 
 
-def _create_geoparquet_metadata(table: pa.Table) -> dict[bytes, bytes]:
+def create_geoparquet_metadata(table: pa.Table) -> dict[bytes, bytes]:
     # TODO: include bbox of geometries
     column_meta = {
         "encoding": "WKB",
@@ -77,7 +80,7 @@ def _create_geoparquet_metadata(table: pa.Table) -> dict[bytes, bytes]:
             }
         },
     }
-    geo_meta: Dict[str, Any] = {
+    geo_meta: dict[str, Any] = {
         "version": "1.1.0-dev",
         "columns": {"geometry": column_meta},
         "primary_column": "geometry",

stac_geoparquet/cli.py

@@ -1,15 +1,16 @@
+from __future__ import annotations
+
 import argparse
 import logging
 import sys
 import os
-from typing import List, Optional
 
 from stac_geoparquet import pc_runner
 
 logger = logging.getLogger("stac_geoparquet.pgstac_reader")
 
 
-def parse_args(args: Optional[List[str]] = None) -> argparse.Namespace:
+def parse_args(args: list[str] | None = None) -> argparse.Namespace:
     parser = argparse.ArgumentParser()
     parser.add_argument(
         "--output-protocol",
@@ -90,7 +91,7 @@ def setup_logging() -> None:
 }
 
 
-def main(inp: Optional[List[str]] = None) -> int:
+def main(inp: list[str] | None = None) -> int:
     import azure.data.tables
 
     args = parse_args(inp)

stac_geoparquet/json_reader.py

@@ -1,16 +1,18 @@
 """Return an iterator of items from an ndjson, a json array of items, or a featurecollection of items."""
 
+from __future__ import annotations
+
 from pathlib import Path
-from typing import Any, Dict, Iterable, Optional, Sequence, Union
+from typing import Any, Iterable, Sequence
 
 import orjson
 
 from stac_geoparquet.arrow._util import batched_iter
 
 
 def read_json(
-    path: Union[str, Path, Iterable[Union[str, Path]]],
-) -> Iterable[Dict[str, Any]]:
+    path: str | Path | Iterable[str | Path],
+) -> Iterable[dict[str, Any]]:
     """Read a json or ndjson file."""
     if isinstance(path, (str, Path)):
         path = [path]
@@ -39,10 +41,10 @@ def read_json(
 
 
 def read_json_chunked(
-    path: Union[str, Path, Iterable[Union[str, Path]]],
+    path: str | Path | Iterable[str | Path],
     chunk_size: int,
     *,
-    limit: Optional[int] = None,
-) -> Iterable[Sequence[Dict[str, Any]]]:
+    limit: int | None = None,
+) -> Iterable[Sequence[dict[str, Any]]]:
     """Read from a JSON or NDJSON file in chunks of `chunk_size`."""
     return batched_iter(read_json(path), chunk_size, limit=limit)

tests/test_delta_lake.py

@@ -0,0 +1,46 @@
+import json
+from pathlib import Path
+
+import pytest
+from deltalake import DeltaTable
+
+from stac_geoparquet.arrow import stac_table_to_items
+from stac_geoparquet.arrow._delta_lake import parse_stac_ndjson_to_delta_lake
+
+from .json_equals import assert_json_value_equal
+
+HERE = Path(__file__).parent
+
+TEST_COLLECTIONS = [
+    "3dep-lidar-copc",
+    # "3dep-lidar-dsm",
+    "cop-dem-glo-30",
+    "io-lulc-annual-v02",
+    # "io-lulc",
+    "landsat-c2-l1",
+    "landsat-c2-l2",
+    "naip",
+    "planet-nicfi-analytic",
+    "sentinel-1-rtc",
+    "sentinel-2-l2a",
+    "us-census",
+]
+
+
+@pytest.mark.parametrize("collection_id", TEST_COLLECTIONS)
+def test_round_trip_via_delta_lake(collection_id: str, tmp_path: Path):
+    path = HERE / "data" / f"{collection_id}-pc.json"
+    out_path = tmp_path / collection_id
+    parse_stac_ndjson_to_delta_lake(path, out_path)
+
+    # Read back into table and convert to json
+    dt = DeltaTable(out_path)
+    table = dt.to_pyarrow_table()
+    items_result = list(stac_table_to_items(table))
+
+    # Compare with original json
+    with open(HERE / "data" / f"{collection_id}-pc.json") as f:
+        items = json.load(f)
+
+    for result, expected in zip(items_result, items):
+        assert_json_value_equal(result, expected, precision=0)