Hey, Just chiming in to say that Hive uses ANTLR; Ashish (athu...@facebook.com) can provide more detailed feedback on their experiences with ANTLR.
Later, Jeff On Sat, Feb 14, 2009 at 5:16 AM, Ted Dunning <ted.dunn...@gmail.com> wrote: > Not even close. > > Take, for example, > > 1) the problem of using the output of a Pig query as the list of files used > as input. > > 2) Or running some query in an iterative fashion until convergence is > reached. > > 3) Or running a pig query, doing a matrix computation on the result and > then > running another pig query on the output of the matrix computation. > > You can do (1) by running a pig query using an external script and then > downloading the output and expanding that into a pig using a template > expansion and then executing that expanded template. > > You can do (2) by having an external script that runs a pig program over > and > over again, downloading the results and checking for convergence. > > You can do (3) by running one program, then downloading results, computing, > uploading results and running another program. > > All of these are maintenance nightmares which would be greatly eased if > pig's semantics could be glued nicely into a good scripting language. > Having access to the AST's would make that pretty easy. > > On Sat, Feb 14, 2009 at 4:10 AM, pi song <pi.so...@gmail.com> wrote: > > > Due to my limited knowledge, I don't quite understand why building ast > from > > outside Pig would be helpful. Isn't Pig Latin already good enough to > > interface to the world? > > > > > > -- > Ted Dunning, CTO > DeepDyve > 4600 Bohannon Drive, Suite 220 > Menlo Park, CA 94025 > www.deepdyve.com > 650-324-0110, ext. 738 > 858-414-0013 (m) >
