Move the loading of the grammar to outside of the process_message fun…

…ction so it's not re-initialized each time a log line is processed.

sandbox/lua/decoders/bind_query_log.lua

@@ -46,13 +46,15 @@ local msg = {
   Fields      = {},
 }
 
+--Load the query log grammar from the bind module:
+local grammar = l.Ct(bind.query_log_grammar)
+
 function process_message ()
 
   --Create a local variable for the log line from the Payload of the incoming Heka message.
   --The LogstreamerInput that generates the messages automatically puts the 
   local query_log_line = read_message("Payload")
-  --Use the bind_query grammar defined farther above to create a local grammar object:
-  local grammar = l.Ct(bind.query_log_grammar)
+
   --Create a fields table and use the :match method on the grammar object to fill it with the Lua table
   --of values generated by parsing the query_log_line:
   fields = grammar:match(query_log_line)