Merge pull request #1062 from getredash/fix_dql

DynamoDB: Better exception handling

redash/query_runner/dynamodb_sql.py

@@ -2,13 +2,15 @@
 import logging
 import sys
 
+
 from redash.query_runner import *
 from redash.utils import JSONEncoder
 
 logger = logging.getLogger(__name__)
 
 try:
     from dql import Engine, FragmentEngine
+    from pyparsing import ParseException
     enabled = True
 except ImportError, e:
     enabled = False
@@ -126,6 +128,9 @@ def run_query(self, query):
             data = {'columns': columns, 'rows': rows}
             json_data = json.dumps(data, cls=JSONEncoder)
             error = None
+        except ParseException as e:
+            error = u"Error parsing query at line {} (column {}):\n{}".format(e.lineno, e.column, e.line)
+            json_data = None
         except (SyntaxError, RuntimeError) as e:
             error = e.message
             json_data = None