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Convert oidvector and int2vector into variable-length arrays. This

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change saves a great deal of space in pg_proc and its primary index,
and it eliminates the former requirement that INDEX_MAX_KEYS and
FUNC_MAX_ARGS have the same value.  INDEX_MAX_KEYS is still embedded
in the on-disk representation (because it affects index tuple header
size), but FUNC_MAX_ARGS is not.  I believe it would now be possible
to increase FUNC_MAX_ARGS at little cost, but haven't experimented yet.
There are still a lot of vestigial references to FUNC_MAX_ARGS, which
I will clean up in a separate pass.  However, getting rid of it
altogether would require changing the FunctionCallInfoData struct,
and I'm not sure I want to buy into that.
This commit is contained in:
Tom Lane
2005-03-29 00:17:27 +00:00
parent 119191609c
commit 70c9763d48
61 changed files with 819 additions and 581 deletions
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55
doc/src/sgml/catalogs.sgml
View File

@@ -1,6 +1,6 @@
<!--
Documentation of the system catalogs, directed toward PostgreSQL developers
$PostgreSQL: pgsql/doc/src/sgml/catalogs.sgml,v 2.97 2005/03/27 23:52:51 tgl Exp $
$PostgreSQL: pgsql/doc/src/sgml/catalogs.sgml,v 2.98 2005/03/29 00:16:49 tgl Exp $
-->
<chapter id="catalogs">
@@ -2007,32 +2007,6 @@
<entry>The OID of the <structname>pg_class</> entry for the table this index is for</entry>
</row>
<row>
<entry><structfield>indkey</structfield></entry>
<entry><type>int2vector</type></entry>
<entry><literal><link linkend="catalog-pg-attribute"><structname>pg_attribute</structname></link>.attnum</literal></entry>
<entry>
This is an array of <structfield>indnatts</structfield> (up to
<symbol>INDEX_MAX_KEYS</symbol>) values that indicate which
table columns this index indexes. For example a value of
<literal>1 3</literal> would mean that the first and the third table
columns make up the index key. A zero in this array indicates that the
corresponding index attribute is an expression over the table columns,
rather than a simple column reference.
</entry>
</row>
<row>
<entry><structfield>indclass</structfield></entry>
<entry><type>oidvector</type></entry>
<entry><literal><link linkend="catalog-pg-opclass"><structname>pg_opclass</structname></link>.oid</literal></entry>
<entry>
For each column in the index key this contains the OID of
the operator class to use. See
<structname>pg_opclass</structname> for details.
</entry>
</row>
<row>
<entry><structfield>indnatts</structfield></entry>
<entry><type>int2</type></entry>
@@ -2063,6 +2037,31 @@
<entry>If true, the table was last clustered on this index.</entry>
</row>
<row>
<entry><structfield>indkey</structfield></entry>
<entry><type>int2vector</type></entry>
<entry><literal><link linkend="catalog-pg-attribute"><structname>pg_attribute</structname></link>.attnum</literal></entry>
<entry>
This is an array of <structfield>indnatts</structfield> values that
indicate which table columns this index indexes. For example a value
of <literal>1 3</literal> would mean that the first and the third table
columns make up the index key. A zero in this array indicates that the
corresponding index attribute is an expression over the table columns,
rather than a simple column reference.
</entry>
</row>
<row>
<entry><structfield>indclass</structfield></entry>
<entry><type>oidvector</type></entry>
<entry><literal><link linkend="catalog-pg-opclass"><structname>pg_opclass</structname></link>.oid</literal></entry>
<entry>
For each column in the index key this contains the OID of
the operator class to use. See
<structname>pg_opclass</structname> for details.
</entry>
</row>
<row>
<entry><structfield>indexprs</structfield></entry>
<entry><type>text</type></entry>
@@ -3637,7 +3636,7 @@
(<structfield>typlen</structfield> = -1),
but some fixed-length (<structfield>typlen</structfield> &gt; 0) types
also have nonzero <structfield>typelem</structfield>, for example
<type>name</type> and <type>oidvector</type>.
<type>name</type> and <type>point</type>.
If a fixed-length type has a <structfield>typelem</structfield> then
its internal representation must be some number of values of the
<structfield>typelem</structfield> data type with no other data.

5
doc/src/sgml/trigger.sgml
View File

@@ -1,5 +1,5 @@
<!--
$PostgreSQL: pgsql/doc/src/sgml/trigger.sgml,v 1.41 2005/01/22 22:56:36 momjian Exp $
$PostgreSQL: pgsql/doc/src/sgml/trigger.sgml,v 1.42 2005/03/29 00:16:49 tgl Exp $
-->
<chapter id="triggers">
@@ -453,7 +453,8 @@ typedef struct Trigger
bool tgdeferrable;
bool tginitdeferred;
int16 tgnargs;
int16 tgattr[FUNC_MAX_ARGS];
int16 tgnattr;
int16 *tgattr;
char **tgargs;
} Trigger;
</programlisting>