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Historical version. PostgreSQL 9.5 reached end of support in February 2021. See the current manual for supported releases.
PostgreSQL 9.5.25 Documentation
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61.6. 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.

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