Thanks for your suggestions, they work very well. One follow up question: Is there a way to dynamically strip STORE and DUMP commands from a loaded in script? So everything works well if I pass in a script without any dump or store keywords. But when there is a dump, I get an error such as "Syntax error, unexpected symbol at or near 'dump'".
I'm calling: Syntax error, unexpected symbol at or near 'dump pig.setBatchOn(); pig.registerQuery(req.query); pig.dumpSchema(pig.getPigContext().getLastAlias()); Iterator<Tuple> iter = pig.openIterator(pig.getPigContext().getLastAlias()); ... Thanks, Jeff On Tue, Mar 5, 2013 at 11:30 AM, Johnny Zhang <[email protected]> wrote: > Hi, Jeff: > Reply inline. > > > On Tue, Mar 5, 2013 at 11:18 AM, Jeff Yuan <[email protected]> wrote: > >> I have a couple of questions regarding job result and schema. The >> context is that I'm trying to create a custom entry point for Pig that >> takes a script, executes it, and always stores the last declared >> alias/variable in a file. Would appreciate any insights to the 2 >> questions I have below or any advice in general. >> >> 1. I'm looking to automatically dump or store the last variable/alias >> that the user has set. I know PigServer.getAliasKeySet or getAliases >> will return a Set or Map of the alias. But they are unordered, is >> there a way to get an ordered list of aliases? >> > Have you try PigServer.getPigContext().getLastAlias()) ? > >> >> 2. I'm interested in getting the result schema and the raw result set. >> Is the best way to do this just PigServer.dumpSchema(alias) to get the >> result schema, and PigServer.openIterator(alias) to get the resulting >> Tuples? >> > yes, as I know, this is a good way to do it. after you get iterator, you > can use below to go through each tuple > while(iter.hasNext()) { > Tuple t = iter.next(); > } > >> >> Thanks, >> Jeff >> > > Johnny
