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Diffstat (limited to 'sqlglot/optimizer/scope.py')
| -rw-r--r-- | sqlglot/optimizer/scope.py | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/sqlglot/optimizer/scope.py b/sqlglot/optimizer/scope.py index 335ff3e..9c0768c 100644 --- a/sqlglot/optimizer/scope.py +++ b/sqlglot/optimizer/scope.py @@ -4,6 +4,7 @@ from enum import Enum, auto from sqlglot import exp from sqlglot.errors import OptimizeError +from sqlglot.helper import find_new_name class ScopeType(Enum): @@ -293,6 +294,8 @@ class Scope: result = {} for name, node in referenced_names: + if name in result: + raise OptimizeError(f"Alias already used: {name}") if name in self.sources: result[name] = (node, self.sources[name]) @@ -594,6 +597,8 @@ def _traverse_tables(scope): if table_name in scope.sources: # This is a reference to a parent source (e.g. a CTE), not an actual table. sources[source_name] = scope.sources[table_name] + elif source_name in sources: + sources[find_new_name(sources, table_name)] = expression else: sources[source_name] = expression continue |