Address code review

Co-authored-by: Vyas Ramasubramani <vyasr@nvidia.com>

python/cudf/cudf/_lib/pylibcudf/io/json.pxd

@@ -1,10 +1,8 @@
 # Copyright (c) 2024, NVIDIA CORPORATION.
 
 from libcpp cimport bool
-from libcpp.string cimport string
 
 from cudf._lib.pylibcudf.io.types cimport SinkInfo, TableWithMetadata
-from cudf._lib.pylibcudf.libcudf.io.types cimport compression_type
 from cudf._lib.pylibcudf.libcudf.types cimport size_type
 
 

python/cudf/cudf/_lib/pylibcudf/io/json.pyx

@@ -48,8 +48,6 @@ cpdef void write_json(
     """
     cdef table_metadata tbl_meta = table_w_meta.metadata
     cdef string na_rep_c = na_rep.encode()
-    cdef string true_value_c = true_value.encode()
-    cdef string false_value_c = false_value.encode()
 
     cdef json_writer_options options = move(
         json_writer_options.builder(sink_info.c_obj, table_w_meta.tbl.view())
@@ -63,9 +61,9 @@ cpdef void write_json(
     if rows_per_chunk != numeric_limits[size_type].max():
         options.set_rows_per_chunk(rows_per_chunk)
     if true_value != "true":
-        options.set_true_value(true_value_c)
+        options.set_true_value(<string>true_value.encode())
     if false_value != "false":
-        options.set_false_value(false_value_c)
+        options.set_false_value(<string>false_value.encode())
 
     with nogil:
         cpp_write_json(options)

python/cudf/cudf/_lib/pylibcudf/io/types.pyx

@@ -55,7 +55,7 @@ cdef class TableWithMetadata:
             if not isinstance(name, str):
                 raise ValueError("Column name must be a string!")
 
-            info.name = move(<string> name.encode())
+            info.name = <string> name.encode()
             info.children = move(self._make_column_info(child_names))
 
             col_name_infos.push_back(info)
@@ -200,60 +200,48 @@ cdef class SinkInfo:
 
     def __init__(self, list sinks):
         cdef vector[data_sink *] data_sinks
-        cdef unique_ptr[data_sink] sink
-
         cdef vector[string] paths
 
         if not sinks:
             raise ValueError("Need to pass at least one sink")
 
-        if isinstance(sinks[0], io.StringIO):
-            data_sinks.reserve(len(sinks))
-            for s in sinks:
-                if not isinstance(s, io.StringIO):
-                    raise ValueError("All sinks must be of the same type!")
-                self.sink_storage.push_back(
-                    unique_ptr[data_sink](new iobase_data_sink(s))
-                )
-                data_sinks.push_back(self.sink_storage.back().get())
-            self.c_obj = sink_info(data_sinks)
-        elif isinstance(sinks[0], io.IOBase):
-            data_sinks.reserve(len(sinks))
-            for s in sinks:
-                # Files opened in text mode expect writes to be str rather than
-                # bytes, which requires conversion from utf-8. If the underlying
-                # buffer is utf-8, we can bypass this conversion by writing
-                # directly to it.
-                if isinstance(s, io.TextIOBase):
+        cdef object initial_sink_cls = type(sinks[0])
+
+        for s in sinks:
+            if not isinstance(s, initial_sink_cls):
+                raise ValueError("All sinks must be of the same type!")
+            if isinstance(s, str):
+                paths.reserve(len(sinks))
+                paths.push_back(<string> s.encode())
+            elif isinstance(s, os.PathLike):
+                paths.reserve(len(sinks))
+                paths.push_back(<string> os.path.expanduser(s).encode())
+            else:
+                data_sinks.reserve(len(sinks))
+                if isinstance(s, (io.StringIO, io.BytesIO)):
+                    self.sink_storage.push_back(
+                        unique_ptr[data_sink](new iobase_data_sink(s))
+                    )
+                elif isinstance(s, io.TextIOBase):
                     if codecs.lookup(s.encoding).name not in {
                         "utf-8",
                         "ascii",
                     }:
-                        raise NotImplementedError(f"Unsupported encoding {s.encoding}")
-                    sink = move(unique_ptr[data_sink](new iobase_data_sink(s.buffer)))
-                elif isinstance(s, io.BytesIO):
-                    sink = move(unique_ptr[data_sink](new iobase_data_sink(s)))
+                        raise NotImplementedError(
+                            f"Unsupported encoding {s.encoding}"
+                        )
+                    self.sink_storage.push_back(
+                        unique_ptr[data_sink](new iobase_data_sink(s.buffer))
+                    )
                 else:
-                    raise ValueError("All sinks must be of the same type!")
+                    raise TypeError(
+                        "Unrecognized input type: {}".format(type(sinks[0]))
+                    )
 
-                self.sink_storage.push_back(
-                    move(sink)
-                )
                 data_sinks.push_back(self.sink_storage.back().get())
+
+        if data_sinks.size() > 0:
             self.c_obj = sink_info(data_sinks)
-        elif isinstance(sinks[0], str):
-            paths.reserve(len(sinks))
-            for s in sinks:
-                if not isinstance(s, str):
-                    raise ValueError("All sinks must be of the same type!")
-                paths.push_back(<string> s.encode())
-            self.c_obj = sink_info(move(paths))
-        elif isinstance(sinks[0], os.PathLike):
-            paths.reserve(len(sinks))
-            for s in sinks:
-                if not isinstance(s, os.PathLike):
-                    raise ValueError("All sinks must be of the same type!")
-                paths.push_back(<string> os.path.expanduser(s).encode())
-            self.c_obj = sink_info(move(paths))
         else:
-            raise TypeError("Unrecognized input type: {}".format(type(sinks[0])))
+            # we don't have sinks so we must have paths to sinks
+            self.c_obj = sink_info(paths)

python/cudf/cudf/pylibcudf_tests/common/utils.py

@@ -145,24 +145,24 @@ def is_fixed_width(plc_dtype: plc.DataType):
     )
 
 
-def nesting(typ) -> tuple[int, int]:
+def nesting_level(typ) -> tuple[int, int]:
     """Return list and struct nesting of a pyarrow type."""
     if isinstance(typ, pa.ListType):
-        list_, struct = nesting(typ.value_type)
+        list_, struct = nesting_level(typ.value_type)
         return list_ + 1, struct
     elif isinstance(typ, pa.StructType):
-        lists, structs = map(max, zip(*(nesting(t.type) for t in typ)))
+        lists, structs = map(max, zip(*(nesting_level(t.type) for t in typ)))
         return lists, structs + 1
     else:
         return 0, 0
 
 
 def is_nested_struct(typ):
-    return nesting(typ)[1] > 1
+    return nesting_level(typ)[1] > 1
 
 
 def is_nested_list(typ):
-    return nesting(typ)[0] > 1
+    return nesting_level(typ)[0] > 1
 
 
 def sink_to_str(sink):

python/cudf/cudf/pylibcudf_tests/conftest.py

@@ -52,7 +52,7 @@ def table_data(request):
     """
     nrows = request.param
 
-    table_dict = dict()
+    table_dict = {}
     # Colnames in the format expected by
     # plc.io.TableWithMetadata
     colnames = []
@@ -63,55 +63,36 @@ def table_data(request):
         rand_vals = np.random.randint(0, nrows, nrows)
         child_colnames = []
 
-        if isinstance(typ, pa.ListType):
-
-            def _generate_list_data(typ):
-                child_colnames = []
-                if isinstance(typ, pa.ListType):
-                    # recurse to get vals
-                    rand_arrs, grandchild_colnames = _generate_list_data(
-                        typ.value_type
-                    )
-                    pa_array = pa.array(
-                        [list(row_vals) for row_vals in zip(rand_arrs)],
-                        type=typ,
-                    )
-                    child_colnames.append(("", grandchild_colnames))
-                else:
-                    # typ is scalar type
-                    pa_array = pa.array(rand_vals).cast(typ)
-                    child_colnames.append(("", []))
-                return pa_array, child_colnames
-
-            rand_arr, child_colnames = _generate_list_data(typ)
-        elif isinstance(typ, pa.StructType):
-
-            def _generate_struct_data(typ):
-                child_colnames = []
-                if isinstance(typ, pa.StructType):
-                    # recurse to get vals
-                    rand_arrs = []
-                    for i in range(typ.num_fields):
-                        rand_arr, grandchild_colnames = _generate_struct_data(
-                            typ.field(i).type
-                        )
-                        rand_arrs.append(rand_arr)
-                        child_colnames.append(
-                            (typ.field(i).name, grandchild_colnames)
-                        )
-
-                    pa_array = pa.StructArray.from_arrays(
-                        [rand_arr for rand_arr in rand_arrs],
-                        names=[
-                            typ.field(i).name for i in range(typ.num_fields)
-                        ],
-                    )
-                else:
-                    # typ is scalar type
-                    pa_array = pa.array(rand_vals).cast(typ)
-                return pa_array, child_colnames
-
-            rand_arr, child_colnames = _generate_struct_data(typ)
+        def _generate_nested_data(typ):
+            child_colnames = []
+
+            # recurse to get vals for children
+            rand_arrs = []
+            for i in range(typ.num_fields):
+                rand_arr, grandchild_colnames = _generate_nested_data(
+                    typ.field(i).type
+                )
+                rand_arrs.append(rand_arr)
+                child_colnames.append((typ.field(i).name, grandchild_colnames))
+
+            if isinstance(typ, pa.StructType):
+                pa_array = pa.StructArray.from_arrays(
+                    [rand_arr for rand_arr in rand_arrs],
+                    names=[typ.field(i).name for i in range(typ.num_fields)],
+                )
+            elif isinstance(typ, pa.ListType):
+                pa_array = pa.array(
+                    [list(row_vals) for row_vals in zip(rand_arrs[0])],
+                    type=typ,
+                )
+                child_colnames.append(("", grandchild_colnames))
+            else:
+                # typ is scalar type
+                pa_array = pa.array(rand_vals).cast(typ)
+            return pa_array, child_colnames
+
+        if isinstance(typ, (pa.ListType, pa.StructType)):
+            rand_arr, child_colnames = _generate_nested_data(typ)
         else:
             rand_arr = pa.array(rand_vals).cast(typ)
 

python/cudf/cudf/pylibcudf_tests/io/test_json.py

@@ -14,7 +14,7 @@ def test_write_json_basic(table_data, source_or_sink, lines, rows_per_chunk):
     plc_table_w_meta, pa_table = table_data
     sink = source_or_sink
 
-    kwargs = dict()
+    kwargs = {}
     if rows_per_chunk <= plc_table_w_meta.tbl.num_rows():
         kwargs["rows_per_chunk"] = rows_per_chunk