fix(format): support rendering empty schemas

ibis-project · Sep 9, 2023 · f8faada · f8faada
1 parent 258a289
commit f8faada
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Showing 3 changed files with 11 additions and 0 deletions.
diff --git a/ibis/expr/format.py b/ibis/expr/format.py
@@ -108,6 +108,8 @@ def render_fields(fields, indent_level=0, limit_items=None):
 
 
 def render_schema(schema, indent_level=0, limit_items=None):
+    if not len(schema):
+        return util.indent("<empty schema>", spaces=indent_level * 2)
     if limit_items is None:
         limit_items = ibis.options.repr.table_columns
     return render(schema, indent_level, limit_items, key_separator="")

diff --git a/ibis/expr/tests/snapshots/test_format/test_format_table_with_empty_schema/repr.txt b/ibis/expr/tests/snapshots/test_format/test_format_table_with_empty_schema/repr.txt
@@ -0,0 +1,2 @@
+UnboundTable: t
+  <empty schema>
diff --git a/ibis/expr/tests/test_format.py b/ibis/expr/tests/test_format.py
@@ -42,6 +42,13 @@ def test_format_projection(alltypes, snapshot):
     snapshot.assert_match(result, "repr.txt")
 
 
+def test_format_table_with_empty_schema(snapshot):
+    # GH #6837
+    schema = ibis.table({}, name="t")
+    result = fmt(schema)
+    snapshot.assert_match(result, "repr.txt")
+
+
 def test_table_type_output(snapshot):
     foo = ibis.table(
         [