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Push index operator lossiness determination down to GIST/GIN opclass

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"consistent" functions, and remove pg_amop.opreqcheck, as per recent
discussion.  The main immediate benefit of this is that we no longer need
8.3's ugly hack of requiring @@@ rather than @@ to test weight-using tsquery
searches on GIN indexes.  In future it should be possible to optimize some
other queries better than is done now, by detecting at runtime whether the
index match is exact or not.

Tom Lane, after an idea of Heikki's, and with some help from Teodor.
This commit is contained in:
Tom Lane
2008-04-14 17:05:34 +00:00
parent 10be77c173
commit 9b5c8d45f6
68 changed files with 1023 additions and 785 deletions
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11
doc/src/sgml/gin.sgml
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@@ -1,4 +1,4 @@
<!-- $PostgreSQL: pgsql/doc/src/sgml/gin.sgml,v 2.13 2007/11/16 03:23:07 tgl Exp $ -->
<!-- $PostgreSQL: pgsql/doc/src/sgml/gin.sgml,v 2.14 2008/04/14 17:05:32 tgl Exp $ -->
<chapter id="GIN">
<title>GIN Indexes</title>
@@ -111,12 +111,12 @@
</varlistentry>
<varlistentry>
<term>bool consistent(bool check[], StrategyNumber n, Datum query)</term>
<term>bool consistent(bool check[], StrategyNumber n, Datum query, bool *recheck)</term>
<listitem>
<para>
Returns TRUE if the indexed value satisfies the query operator with
strategy number <literal>n</> (or would satisfy, if the operator is
marked RECHECK in the operator class). The <literal>check</> array has
strategy number <literal>n</> (or might satisfy, if the recheck
indication is returned). The <literal>check</> array has
the same length as the number of keys previously returned by
<function>extractQuery</> for this query. Each element of the
<literal>check</> array is TRUE if the indexed value contains the
@@ -124,6 +124,9 @@
<function>extractQuery</> result array is present in the indexed value.
The original <literal>query</> datum (not the extracted key array!) is
passed in case the <function>consistent</> method needs to consult it.
On success, <literal>*recheck</> should be set to TRUE if the heap
tuple needs to be rechecked against the query operator, or FALSE if
the index test is exact.
</para>
</listitem>
</varlistentry>