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* Add support NULL to GiST.

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* some refactoring and simplify code int gistutil.c and gist.c
* now in some cases it can be called used-defined
  picksplit method for non-first column in index, but here
	is a place to do more.
* small fix of docs related to support NULL.
This commit is contained in:
Teodor Sigaev
2006-05-24 11:01:39 +00:00
parent 86722057fd
commit d2158b0281
8 changed files with 375 additions and 430 deletions
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5
doc/src/sgml/indexam.sgml
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@@ -1,4 +1,4 @@
<!-- $PostgreSQL: pgsql/doc/src/sgml/indexam.sgml,v 2.11 2006/05/10 23:18:38 tgl Exp $ -->
<!-- $PostgreSQL: pgsql/doc/src/sgml/indexam.sgml,v 2.12 2006/05/24 11:01:39 teodor Exp $ -->
<chapter id="indexam">
<title>Index Access Method Interface Definition</title>
@@ -126,8 +126,7 @@
used to scan for rows with <literal>a = 4</literal>, which is wrong if the
index omits rows where <literal>b</> is null.
It is, however, OK to omit rows where the first indexed column is null.
(GiST currently does so.) Thus,
<structfield>amindexnulls</structfield> should be set true only if the
Thus, <structfield>amindexnulls</structfield> should be set true only if the
index access method indexes all rows, including arbitrary combinations of
null values.
</para>