| PostgreSQL 9.2.24 Documentation | ||||
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GIN assumes that indexable
operators are strict. This means that extractValue will not be called at all on a
NULL item value (instead, a placeholder index entry is created
automatically), and extractQuery
will not be called on a NULL query value either (instead, the
query is presumed to be unsatisfiable). Note however that NULL
key values contained within a non-null composite item or query
value are supported.