| PostgreSQL 9.3.25 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.