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540ac7cea9
The code expands a varbit gist leaf key to a node key by copying the bit data twice in a varlen datum, as both the lower and upper key. The lower key was expanded to INTALIGN size, but the padding bytes were not initialized. That's a problem because when the lower/upper keys are compared, the padding bytes are used compared too, when the values are otherwise equal. That could lead to incorrect query results. REINDEX is advised for any btree_gist indexes on bit or bit varying data type, to fix any garbage padding bytes on disk. Per Valgrind, reported by Andres Freund. Backpatch to all supported versions.
The PostgreSQL contrib tree
---------------------------
This subtree contains porting tools, analysis utilities, and plug-in
features that are not part of the core PostgreSQL system, mainly
because they address a limited audience or are too experimental to be
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User documentation for each module appears in the main SGML
documentation.
When building from the source distribution, these modules are not
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Some directories supply new user-defined functions, operators, or
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the code you need to register the new SQL objects in the database
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you can simply do
CREATE EXTENSION module_name;
See the PostgreSQL documentation for more information about this
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