chore: add ddl accessor to list_views

ibis/backends/__init__.py

@@ -87,6 +87,17 @@ def _ipython_key_completions_(self) -> list[str]:
         return self._backend.list_tables()
 
 
+class DdlAccessor:
+    """ddl accessor list views."""
+
+    def __init__(self, backend: BaseBackend):
+        self._backend = backend
+
+    def list_views(self) -> list[str]:
+        """List the names of views in the database."""
+        return self._backend.list_views()
+
+
 class _FileIOHandler:
     @staticmethod
     def _import_pyarrow():
@@ -895,6 +906,14 @@ def _filter_with_like(values: Iterable[str], like: str | None = None) -> list[st
         pattern = re.compile(like)
         return sorted(filter(pattern.findall, values))
 
+    @abc.abstractmethod
+    def list_views(
+        self,
+        like: str | None = None,
+        database: str | None = None,
+    ) -> list[str]:
+        """List the names of views in the database."""
+
     @abc.abstractmethod
     def list_tables(
         self, like: str | None = None, database: tuple[str, str] | str | None = None
@@ -983,6 +1002,11 @@ def tables(self):
         """
         return TablesAccessor(self)
 
+    @functools.cached_property
+    def ddl(self):
+        """A ddl accessor."""
+        return DdlAccessor(self)
+
     @property
     @abc.abstractmethod
     def version(self) -> str:

ibis/backends/duckdb/__init__.py

@@ -1037,6 +1037,32 @@ def list_tables(
 
         return self._filter_with_like(out[col].to_pylist(), like)
 
+    def list_views(
+        self,
+        like: str | None = None,
+        database: tuple[str, str] | str | None = None,
+        schema: str | None = None,
+    ) -> list[str]:
+        """List views."""
+        # return ["test1", "test2"]
+        table_loc = self._warn_and_create_table_loc(database, schema)
+
+        database = self.compiler.f.current_schema()
+        if table_loc is not None:
+            database = table_loc.db or database
+
+        col = "view_name"
+        sql = (
+            sg.select(col)
+            .from_(sg.table("duckdb_views"))
+            .distinct()
+            .where(C.schema_name.eq(database))
+            .sql(self.name, pretty=True)
+        )
+        out = self.con.execute(sql).fetch_arrow_table()
+
+        return self._filter_with_like(out[col].to_pylist(), like)
+
     def read_postgres(
         self, uri: str, *, table_name: str | None = None, database: str = "public"
     ) -> ir.Table:

ibis/backends/tests/test_api.py

@@ -142,3 +142,15 @@ def test_unbind(alltypes, expr_fn):
 
     assert "Unbound" not in repr(expr)
     assert "Unbound" in repr(expr.unbind())
+
+
+###for now let's just try duckdb
+def test_list_views(ddl_con, temp_view):
+    expr = ddl_con.table("functional_alltypes")
+    ddl_con.create_view(temp_view, expr)
+
+    views = ddl_con.list_views()
+    assert isinstance(views, list)
+    assert temp_view in views
+
+    assert temp_view not in ddl_con.list_tables()