Adding upstream version 23.10.0.

Signed-off-by: Daniel Baumann <daniel@debian.org>

sqlglot/transforms.py

@@ -140,6 +140,26 @@ def remove_precision_parameterized_types(expression: exp.Expression) -> exp.Expr
     return expression
 
 
+def unqualify_unnest(expression: exp.Expression) -> exp.Expression:
+    """Remove references to unnest table aliases, added by the optimizer's qualify_columns step."""
+    from sqlglot.optimizer.scope import find_all_in_scope
+
+    if isinstance(expression, exp.Select):
+        unnest_aliases = {
+            unnest.alias
+            for unnest in find_all_in_scope(expression, exp.Unnest)
+            if isinstance(unnest.parent, (exp.From, exp.Join))
+        }
+        if unnest_aliases:
+            for column in expression.find_all(exp.Column):
+                if column.table in unnest_aliases:
+                    column.set("table", None)
+                elif column.db in unnest_aliases:
+                    column.set("db", None)
+
+    return expression
+
+
 def unnest_to_explode(expression: exp.Expression) -> exp.Expression:
     """Convert cross join unnest into lateral view explode."""
     if isinstance(expression, exp.Select):