Yes, BlockTreeTermsWriter uses freezeTail to figure out where to draw the lines for assigning terms to blocks, but to build the trie terms index it builds a separate FST, by adding in each block's prefix (it doesn't use the FST's builder pruning to create the trie).
Mike McCandless http://blog.mikemccandless.com On Fri, Nov 15, 2013 at 1:33 PM, Ravikumar Govindarajan <ravikumar.govindara...@gmail.com> wrote: > Yeah, now I kind of understood. > > Is this why BlockTreeTermsWriter plugs in it's freezeTail logic of meeting > min-nbr of terms per block and building a trie for locating sub-blocks? > > -- > Ravi > > > On Fri, Nov 15, 2013 at 11:17 PM, Michael McCandless < > luc...@mikemccandless.com> wrote: > >> When you turn on pruning, FST Builder will just remove nodes that >> don't have a high enough count of input terms traversing through them. >> E.g. if minSuffixCount1 is 100 then only FST nodes that see >= 100 >> input terms coming through them, are preserved. >> >> You can use this to build a prefix trie instead of the full FST. >> >> Creating a custom tail freezer is very expert: it lets you implement >> arbitrary logic on which nodes are pruned or not. >> >> Mike McCandless >> >> http://blog.mikemccandless.com >> >> >> On Fri, Nov 15, 2013 at 12:16 PM, Ravikumar Govindarajan >> <ravikumar.govindara...@gmail.com> wrote: >> > I was trying to understand some logic in Builder class of FST. >> > >> > The method freezeTail() looks quite hairy. I gather that there is an some >> > logic for pruning a node or compiling it. >> > >> > What exactly is pruning a node? An example of it will be really really >> > helpful >> > >> > -- >> > Ravi >> >> --------------------------------------------------------------------- >> To unsubscribe, e-mail: java-user-unsubscr...@lucene.apache.org >> For additional commands, e-mail: java-user-h...@lucene.apache.org >> >> --------------------------------------------------------------------- To unsubscribe, e-mail: java-user-unsubscr...@lucene.apache.org For additional commands, e-mail: java-user-h...@lucene.apache.org
