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Rethink original decision to use AND/OR Expr nodes to represent bitmap

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logic operations during planning.  Seems cleaner to create two new Path
node types, instead --- this avoids duplication of cost-estimation code.
Also, create an enable_bitmapscan GUC parameter to control use of bitmap
plans.
This commit is contained in:
Tom Lane
2005-04-21 19:18:13 +00:00
parent c6221db3c0
commit 14c7fba3f7
16 changed files with 340 additions and 195 deletions
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23
doc/src/sgml/runtime.sgml
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@ -1,5 +1,5 @@
<!--
$PostgreSQL: pgsql/doc/src/sgml/runtime.sgml,v 1.313 2005/04/08 00:59:57 neilc Exp $
$PostgreSQL: pgsql/doc/src/sgml/runtime.sgml,v 1.314 2005/04/21 19:18:12 tgl Exp $
-->
<chapter Id="runtime">
@ -1768,6 +1768,22 @@ archive_command = 'copy "%p" /mnt/server/archivedir/"%f"' # Windows
</para>
<variablelist>
<varlistentry id="guc-enable-bitmapscan" xreflabel="enable_bitmapscan">
<term><varname>enable_bitmapscan</varname> (<type>boolean</type>)</term>
<indexterm>
<primary>bitmap scan</primary>
</indexterm>
<indexterm>
<primary><varname>enable_bitmapscan</> configuration parameter</primary>
</indexterm>
<listitem>
<para>
Enables or disables the query planner's use of bitmap-scan plan
types. The default is on.
</para>
</listitem>
</varlistentry>
<varlistentry id="guc-enable-hashagg" xreflabel="enable_hashagg">
<term><varname>enable_hashagg</varname> (<type>boolean</type>)</term>
<indexterm>
@ -4094,7 +4110,7 @@ plruby.bar = true # generates error, unknown class name
<row>
<entry>
<option>-fi</option>, <option>-fh</option>,
<option>-fb</option>, <option>-fh</option>, <option>-fi</option>,
<option>-fm</option>, <option>-fn</option>,
<option>-fs</option>, <option>-ft</option><footnote
id="fn.runtime-config-short">
@ -4111,8 +4127,9 @@ $ <userinput>postmaster -o '-S 1024 -s'</userinput>
</footnote>
</entry>
<entry>
<literal>enable_indexscan = off</>,
<literal>enable_bitmapscan = off</>,
<literal>enable_hashjoin = off</>,
<literal>enable_indexscan = off</>,
<literal>enable_mergejoin = off</>,
<literal>enable_nestloop = off</>,
<literal>enable_seqscan = off</>,