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Minor improvements to the Gin internal documentation.

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Neil Conway 2008-07-08 03:25:42 +00:00
parent 70d15a51b2
commit 68af3752de
1 changed files with 4 additions and 4 deletions
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src/backend/access/gin/README
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@ -1,4 +1,4 @@
$PostgreSQL: pgsql/src/backend/access/gin/README,v 1.5 2008/03/20 17:55:14 momjian Exp $ $PostgreSQL: pgsql/src/backend/access/gin/README,v 1.6 2008/07/08 03:25:42 neilc Exp $
Gin for PostgreSQL Gin for PostgreSQL
================== ==================
@ -25,8 +25,8 @@ for tsvector) and where each tuple in a leaf page is either a pointer to a
B-tree over item pointers (PT, posting tree), or a list of item pointers B-tree over item pointers (PT, posting tree), or a list of item pointers
(PL, posting list) if the tuple is small enough. (PL, posting list) if the tuple is small enough.
Note: There is no delete operation for ET. The reason for this is that from Note: There is no delete operation for ET. The reason for this is that in
our experience, a set of unique words over a large collection change very our experience, the set of distinct words in a large corpus changes very
rarely. This greatly simplifies the code and concurrency algorithms. rarely. This greatly simplifies the code and concurrency algorithms.
Gin comes with built-in support for one-dimensional arrays (eg. integer[], Gin comes with built-in support for one-dimensional arrays (eg. integer[],
@ -64,7 +64,7 @@ itself is very fast.)
Such queries usually contain very frequent lexemes, so the results are not Such queries usually contain very frequent lexemes, so the results are not
very helpful. To facilitate execution of such queries Gin has a configurable very helpful. To facilitate execution of such queries Gin has a configurable
soft upper limit of the size of the returned set, determined by the soft upper limit on the size of the returned set, determined by the
'gin_fuzzy_search_limit' GUC variable. This is set to 0 by default (no 'gin_fuzzy_search_limit' GUC variable. This is set to 0 by default (no
limit). limit).