18th October 2018: PostgreSQL 11 Released!
Supported Versions: Current (11) / 10 / 9.6 / 9.5 / 9.4 / 9.3
Development Versions: devel
Unsupported versions: 9.2 / 9.1 / 9.0 / 8.4 / 8.3 / 8.2

55.5. Limitations

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.