Revert "Preprocess the where clauses." (#2411)

* Revert "Display full name. (#2378)"

This reverts commit 5b19528662.

* Revert "Preprocess the where clauses. (#2405)"

This reverts commit 357773c631.

superset/connectors/sqla/models.py

@@ -517,7 +517,6 @@ class SqlaTable(Model, BaseDatasource):
         )
         logging.info(sql)
         sql = sqlparse.format(sql, reindent=True)
-        sql = self.database.db_engine_spec.sql_preprocessor(sql)
         return sql
 
     def query(self, query_obj):

superset/db_engine_specs.py

@@ -115,9 +115,9 @@ class BaseEngineSpec(object):
     def sql_preprocessor(cls, sql):
         """If the SQL needs to be altered prior to running it
 
-        For example db api needs to double `%` characters
+        For example Presto needs to double `%` characters
         """
-        return sql.replace('%', '%%')
+        return sql
 
     @classmethod
     def patch(cls):
@@ -279,6 +279,10 @@ class PrestoEngineSpec(BaseEngineSpec):
         from superset.db_engines import presto as patched_presto
         presto.Cursor.cancel = patched_presto.cancel
 
+    @classmethod
+    def sql_preprocessor(cls, sql):
+        return sql.replace('%', '%%')
+
     @classmethod
     def convert_dttm(cls, target_type, dttm):
         tt = target_type.upper()