1 files changed, 5 insertions, 2 deletions
diff --git a/sqlglot/optimizer/isolate_table_selects.py b/sqlglot/optimizer/isolate_table_selects.py
index 652cdef..5bd7b30 100644
--- a/sqlglot/optimizer/isolate_table_selects.py
+++ b/sqlglot/optimizer/isolate_table_selects.py
@@ -1,15 +1,18 @@
 from sqlglot import alias, exp
 from sqlglot.errors import OptimizeError
 from sqlglot.optimizer.scope import traverse_scope
+from sqlglot.schema import ensure_schema
 
 
-def isolate_table_selects(expression):
+def isolate_table_selects(expression, schema=None):
+    schema = ensure_schema(schema)
+
     for scope in traverse_scope(expression):
         if len(scope.selected_sources) == 1:
             continue
 
         for (_, source) in scope.selected_sources.values():
-            if not isinstance(source, exp.Table):
+            if not isinstance(source, exp.Table) or not schema.column_names(source):
                 continue
 
             if not source.alias: