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Commit0a02e2a

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GIN support for @@ and @? jsonpath operators
This commit makes existing GIN operator classes jsonb_ops and json_path_opssupport "jsonb @@ jsonpath" and "jsonb @? jsonpath" operators. Basic idea isto extract statements of following form out of jsonpath. key1.key2. ... .keyN = constThe rest of jsonpath is rechecked from heap.Catversion is bumped.Discussion:https://postgr.es/m/fcc6fc6a-b497-f39a-923d-aa34d0c588e8%402ndQuadrant.comAuthor: Nikita Glukhov, Alexander KorotkovReviewed-by: Jonathan Katz, Pavel Stehule
1 parent7241911 commit0a02e2a

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11 files changed

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-78
lines changed

11 files changed

+1456
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lines changed

‎doc/src/sgml/gin.sgml‎

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@@ -102,13 +102,17 @@
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<literal>?&amp;</literal>
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<literal>?|</literal>
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<literal>@&gt;</literal>
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<literal>@?</literal>
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<literal>@@</literal>
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</entry>
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</row>
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<row>
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<entry><literal>jsonb_path_ops</literal></entry>
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<entry><type>jsonb</type></entry>
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<entry>
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<literal>@&gt;</literal>
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<literal>@?</literal>
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<literal>@@</literal>
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</entry>
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</row>
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<row>

‎doc/src/sgml/json.sgml‎

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@@ -480,6 +480,22 @@ CREATE INDEX idxgintags ON api USING GIN ((jdoc -&gt; 'tags'));
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(More information on expression indexes can be found in <xref
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linkend="indexes-expressional"/>.)
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</para>
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<para>
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Also, GIN index supports <literal>@@</literal> and <literal>@?</literal>
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operators, which perform <literal>jsonpath</literal> matching.
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<programlisting>
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SELECT jdoc->'guid', jdoc->'name' FROM api WHERE jdoc @@ '$.tags[*] == "qui"';
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</programlisting>
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<programlisting>
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SELECT jdoc->'guid', jdoc->'name' FROM api WHERE jdoc @@ '$.tags[*] ? (@ == "qui")';
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</programlisting>
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GIN index extracts statements of following form out of
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<literal>jsonpath</literal>: <literal>accessors_chain = const</literal>.
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Accessors chain may consist of <literal>.key</literal>,
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<literal>[*]</literal> and <literal>[index]</literal> accessors.
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<literal>jsonb_ops</literal> additionally supports <literal>.*</literal>
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and <literal>.**</literal> statements.
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</para>
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<para>
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Another approach to querying is to exploit containment, for example:
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<programlisting>
@@ -498,7 +514,8 @@ SELECT jdoc-&gt;'guid', jdoc-&gt;'name' FROM api WHERE jdoc @&gt; '{"tags": ["qu
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<para>
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Although the <literal>jsonb_path_ops</literal> operator class supports
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only queries with the <literal>@&gt;</literal> operator, it has notable
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only queries with the <literal>@&gt;</literal>, <literal>@@</literal>
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and <literal>@?</literal> operators, it has notable
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performance advantages over the default operator
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class <literal>jsonb_ops</literal>. A <literal>jsonb_path_ops</literal>
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index is usually much smaller than a <literal>jsonb_ops</literal>

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