Skip to content

BUG: fix to_json() with JSON Table Schema work correctly with string dtype #61900

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
merged 8 commits into from
Jul 26, 2025
Merged

BUG: fix to_json() with JSON Table Schema work correctly with string dtype #61900

Show file tree
Hide file tree
Changes from 2 commits
Commits
Show all changes
8 commits
Select commit Hold shift + click to select a range
2ad36c9
to_json() with JSON table schema type fix
Jul 18, 2025
359f74e
Merge branch 'main' into issue_61889
khemkaran10 Jul 20, 2025
164e716
Merge branch 'main' into issue_61889
khemkaran10 Jul 21, 2025
a048e69
removed redundant check in as_json_table_type
Jul 21, 2025
e84d1db
Merge branch 'main' into issue_61889
khemkaran10 Jul 22, 2025
8de5922
changed the default return type to None in convert_json_field_to_pand…
Jul 22, 2025
3ffd450
Merge remote-tracking branch 'upstream/main' into issue_61889
jorisvandenbossche Jul 26, 2025
41ff344
add whatsnew note
jorisvandenbossche Jul 26, 2025
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
6 changes: 3 additions & 3 deletions pandas/io/json/_table_schema.py
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -90,10 +90,10 @@ def as_json_table_type(x: DtypeObj) -> str:
return "datetime"
elif lib.is_np_dtype(x, "m"):
return "duration"
elif isinstance(x, ExtensionDtype):
return "any"
elif is_string_dtype(x):
return "string"
elif isinstance(x, ExtensionDtype):
return "any"
else:
return "any"

Expand Down Expand Up @@ -197,7 +197,7 @@ def convert_json_field_to_pandas_type(field) -> str | CategoricalDtype:
"""
typ = field["type"]
if typ == "string":
return "object"
return field.get("extDtype", "object")
elif typ == "integer":
return field.get("extDtype", "int64")
elif typ == "number":
Expand Down
8 changes: 4 additions & 4 deletions pandas/tests/io/json/test_json_table_schema.py
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -70,7 +70,7 @@ def test_build_table_schema(self, df_schema, using_infer_string):
"primaryKey": ["idx"],
}
if using_infer_string:
expected["fields"][2] = {"name": "B", "type": "any", "extDtype": "str"}
expected["fields"][2] = {"name": "B", "type": "string", "extDtype": "str"}
assert result == expected
result = build_table_schema(df_schema)
assert "pandas_version" in result
Expand Down Expand Up @@ -120,10 +120,10 @@ def test_multiindex(self, df_schema, using_infer_string):
if using_infer_string:
expected["fields"][0] = {
"name": "level_0",
"type": "any",
"type": "string",
"extDtype": "str",
}
expected["fields"][3] = {"name": "B", "type": "any", "extDtype": "str"}
expected["fields"][3] = {"name": "B", "type": "string", "extDtype": "str"}
assert result == expected

df.index.names = ["idx0", None]
Expand Down Expand Up @@ -303,7 +303,7 @@ def test_to_json(self, df_table, using_infer_string):
]

if using_infer_string:
fields[2] = {"name": "B", "type": "any", "extDtype": "str"}
fields[2] = {"name": "B", "type": "string", "extDtype": "str"}

schema = {"fields": fields, "primaryKey": ["idx"]}
data = [
Expand Down
10 changes: 5 additions & 5 deletions pandas/tests/io/json/test_json_table_schema_ext_dtype.py
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -50,7 +50,7 @@ def test_build_table_schema(self):
{"name": "index", "type": "integer"},
{"name": "A", "type": "any", "extDtype": "DateDtype"},
{"name": "B", "type": "number", "extDtype": "decimal"},
{"name": "C", "type": "any", "extDtype": "string"},
{"name": "C", "type": "string", "extDtype": "string"},
{"name": "D", "type": "integer", "extDtype": "Int64"},
],
"primaryKey": ["index"],
Expand Down Expand Up @@ -80,10 +80,10 @@ def test_as_json_table_type_ext_decimal_dtype(self):
@pytest.mark.parametrize("box", [lambda x: x, Series])
def test_as_json_table_type_ext_string_array_dtype(self, box):
string_data = box(array(["pandas"], dtype="string"))
assert as_json_table_type(string_data.dtype) == "any"
assert as_json_table_type(string_data.dtype) == "string"

def test_as_json_table_type_ext_string_dtype(self):
assert as_json_table_type(StringDtype()) == "any"
assert as_json_table_type(StringDtype()) == "string"

@pytest.mark.parametrize("box", [lambda x: x, Series])
def test_as_json_table_type_ext_integer_array_dtype(self, box):
Expand Down Expand Up @@ -176,7 +176,7 @@ def test_build_string_series(self, sa):

fields = [
{"name": "id", "type": "integer"},
{"name": "a", "type": "any", "extDtype": "string"},
{"name": "a", "type": "string", "extDtype": "string"},
]

schema = {"fields": fields, "primaryKey": ["id"]}
Expand Down Expand Up @@ -235,7 +235,7 @@ def test_to_json(self, da, dc, sa, ia):
OrderedDict({"name": "idx", "type": "integer"}),
OrderedDict({"name": "A", "type": "any", "extDtype": "DateDtype"}),
OrderedDict({"name": "B", "type": "number", "extDtype": "decimal"}),
OrderedDict({"name": "C", "type": "any", "extDtype": "string"}),
OrderedDict({"name": "C", "type": "string", "extDtype": "string"}),
OrderedDict({"name": "D", "type": "integer", "extDtype": "Int64"}),
]

Expand Down
Loading