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-rw-r--r--sqlglot/dialects/clickhouse.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/sqlglot/dialects/clickhouse.py b/sqlglot/dialects/clickhouse.py
index 9e8c691..b553df2 100644
--- a/sqlglot/dialects/clickhouse.py
+++ b/sqlglot/dialects/clickhouse.py
@@ -9,7 +9,7 @@ from sqlglot.parser import parse_var_map
from sqlglot.tokens import TokenType
-def _lower_func(sql):
+def _lower_func(sql: str) -> str:
index = sql.index("(")
return sql[:index].lower() + sql[index:]