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Rename jsonb_hash_ops to jsonb_path_ops.

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There's no longer much pressure to switch the default GIN opclass for
jsonb, but there was still some unhappiness with the name "jsonb_hash_ops",
since hashing is no longer a distinguishing property of that opclass,
and anyway it seems like a relatively minor detail.  At the suggestion of
Heikki Linnakangas, we'll use "jsonb_path_ops" instead; that captures the
important characteristic that each index entry depends on the entire path
from the document root to the indexed value.

Also add a user-facing explanation of the implementation properties of
these two opclasses.
This commit is contained in:
Tom Lane
2014-05-11 12:06:04 -04:00
parent e136271a94
commit 12e611d43e
12 changed files with 78 additions and 44 deletions
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4
doc/src/sgml/gin.sgml
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@@ -395,7 +395,7 @@
</entry>
</row>
<row>
<entry><literal>jsonb_hash_ops</></entry>
<entry><literal>jsonb_path_ops</></entry>
<entry><type>jsonb</></entry>
<entry>
<literal>@&gt;</>
@@ -415,7 +415,7 @@
<para>
Of the two operator classes for type <type>jsonb</>, <literal>jsonb_ops</>
is the default. <literal>jsonb_hash_ops</> supports fewer operators but
is the default. <literal>jsonb_path_ops</> supports fewer operators but
offers better performance for those operators.
See <xref linkend="json-indexing"> for details.
</para>