Fixes parsing config using bracketed section name

src/sql/parse.py

@@ -16,7 +16,7 @@ def connection_from_dsn_section(section, config):
     return str(URL(**cfg_dict))
 
 
-def _connection_string(s):
+def _connection_string(s, config):
 
     s = expandvars(s)  # for environment variables
     if "@" in s or "://" in s:
@@ -46,7 +46,7 @@ def parse(cell, config):
     pieces = cell.split(None, 3)
     if not pieces:
         return result
-    result["connection"] = _connection_string(pieces[0])
+    result["connection"] = _connection_string(pieces[0], config)
     if result["connection"]:
         pieces.pop(0)
     if len(pieces) > 1 and pieces[1] == "<<":