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Add BRIN infrastructure for "inclusion" opclasses

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This lets BRIN be used with R-Tree-like indexing strategies.

Also provided are operator classes for range types, box and inet/cidr.
The infrastructure provided here should be sufficient to create operator
classes for similar datatypes; for instance, opclasses for PostGIS
geometries should be doable, though we didn't try to implement one.

(A box/point opclass was also submitted, but we ripped it out before
commit because the handling of floating point comparisons in existing
code is inconsistent and would generate corrupt indexes.)

Author: Emre Hasegeli.  Cosmetic changes by me
Review: Andreas Karlsson
This commit is contained in:
Alvaro Herrera
2015-05-15 18:05:22 -03:00
parent 199f5973c5
commit b0b7be6133
18 changed files with 928 additions and 105 deletions
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53
doc/src/sgml/brin.sgml
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@ -72,7 +72,9 @@
<para>
The <firstterm>minmax</>
operator classes store the minimum and the maximum values appearing
in the indexed column within the range.
in the indexed column within the range. The <firstterm>inclusion</>
operator classes store a value which includes the values in the indexed
column within the range.
</para>
<table id="brin-builtin-opclasses-table">
@ -251,6 +253,18 @@
<literal>&gt;</literal>
</entry>
</row>
<row>
<entry><literal>inet_inclusion_ops</literal></entry>
<entry><type>inet</type></entry>
<entry>
<literal>&amp;&amp;</>
<literal>&gt;&gt;</>
<literal>&gt;&gt;=</>
<literal>&lt;&lt;</literal>
<literal>&lt;&lt;=</literal>
<literal>=</literal>
</entry>
</row>
<row>
<entry><literal>bpchar_minmax_ops</literal></entry>
<entry><type>character</type></entry>
@ -372,6 +386,25 @@
<literal>&gt;</literal>
</entry>
</row>
<row>
<entry><literal>range_inclusion_ops</></entry>
<entry><type>any range type</type></entry>
<entry>
<literal>&amp;&amp;</>
<literal>&amp;&gt;</>
<literal>&amp;&lt;</>
<literal>&gt;&gt;</>
<literal>&lt;&lt;</>
<literal>&lt;@</>
<literal>=</>
<literal>@&gt;</>
<literal>&lt;</literal>
<literal>&lt;=</literal>
<literal>=</literal>
<literal>&gt;=</literal>
<literal>&gt;</literal>
</entry>
</row>
<row>
<entry><literal>pg_lsn_minmax_ops</literal></entry>
<entry><type>pg_lsn</type></entry>
@ -383,6 +416,24 @@
<literal>&gt;</literal>
</entry>
</row>
<row>
<entry><literal>box_inclusion_ops</></entry>
<entry><type>box</type></entry>
<entry>
<literal>&amp;&amp;</>
<literal>&amp;&gt;</>
<literal>&amp;&lt;</>
<literal>&gt;&gt;</>
<literal>&lt;&lt;</>
<literal>&lt;@</>
<literal>~=</>
<literal>@&gt;</>
<literal>&amp;&gt;|</>
<literal>|&amp;&lt;</>
<literal>&gt;&gt;|</>
<literal>|&lt;&lt;</literal>
</entry>
</row>
</tbody>
</tgroup>
</table>