fix(duckdb): allow setting auto_detect to False by fixing translation of columns argument (#10065)

Author: cpcloud

ibis/backends/duckdb/__init__.py

@@ -600,6 +600,7 @@ def read_json(
         self,
         source_list: str | list[str] | tuple[str],
         table_name: str | None = None,
+        columns: Mapping[str, str] | None = None,
         **kwargs,
     ) -> ir.Table:
         """Read newline-delimited JSON into an ibis table.
@@ -614,8 +615,13 @@ def read_json(
             File or list of files
         table_name
             Optional table name
+        columns
+            Optional mapping from string column name to duckdb type string.
         **kwargs
-            Additional keyword arguments passed to DuckDB's `read_json_auto` function
+            Additional keyword arguments passed to DuckDB's `read_json_auto` function.
+
+            See https://duckdb.org/docs/data/json/overview.html#json-loading
+            for parameters and more information about reading JSON.
 
         Returns
         -------
@@ -630,6 +636,21 @@ def read_json(
             sg.to_identifier(key).eq(sge.convert(val)) for key, val in kwargs.items()
         ]
 
+        if columns:
+            options.append(
+                sg.to_identifier("columns").eq(
+                    sge.Struct.from_arg_list(
+                        [
+                            sge.PropertyEQ(
+                                this=sg.to_identifier(key),
+                                expression=sge.convert(value),
+                            )
+                            for key, value in columns.items()
+                        ]
+                    )
+                )
+            )
+
         self._create_temp_view(
             table_name,
             sg.select(STAR).from_(

ibis/backends/duckdb/tests/test_register.py

@@ -505,3 +505,16 @@ def test_memtable_null_column_parquet_dtype_roundtrip(con, tmp_path):
     after = con.read_parquet(tmp_path / "tmp.parquet")
 
     assert before.a.type() == after.a.type()
+
+
+def test_read_json_no_auto_detection(con, tmp_path):
+    ndjson_data = """
+    {"year": 2007}
+    {"year": 2008}
+    {"year": 2009}
+    """
+    path = tmp_path.joinpath("test.ndjson")
+    path.write_text(ndjson_data)
+
+    t = con.read_json(path, auto_detect=False, columns={"year": "varchar"})
+    assert t.year.type() == dt.string