feat(snowflake): support binary variance reduction with filters

ibis/backends/postgres/registry.py

@@ -448,12 +448,17 @@ def variance_compiler(t, op):
         if (y_type := y.output_dtype).is_boolean():
             y = ops.Cast(y, dt.Int32(nullable=y_type.nullable))
 
-        result = func(t.translate(x), t.translate(y))
+        if t._has_reduction_filter_syntax:
+            result = func(t.translate(x), t.translate(y))
 
-        if (where := op.where) is not None:
-            return result.filter(t.translate(where))
-
-        return result
+            if (where := op.where) is not None:
+                return result.filter(t.translate(where))
+            return result
+        else:
+            if (where := op.where) is not None:
+                x = ops.Where(where, x, None)
+                y = ops.Where(where, y, None)
+            return func(t.translate(x), t.translate(y))
 
     return variance_compiler
 

ibis/backends/tests/test_aggregation.py

@@ -722,12 +722,6 @@ def test_quantile(
             lambda t: t.yearID.isin([2009, 2015]),
             lambda t: t.yearID.isin([2009, 2015]),
             id='cond',
-            marks=[
-                pytest.mark.broken(
-                    ["snowflake"],
-                    reason=("snowflake doesn't allow quoted columns in group_by"),
-                ),
-            ],
         ),
     ],
 )