Strategy number
The index method's strategy number for an operator associated with the operator class.
Schema of operator and Operator name
The operator associated with the operator class.
Recheck
With this option selected, the index is "lossy" for this operator,
and so the rows retrieved using the index must be rechecked to verify that
they actually satisfy the qualification clause involving this operator.
Note: Before PostgreSQL 8.4, the OPERATOR clause could include a RECHECK option. This is no longer supported because whether an index operator is "lossy" is now determined on-the-fly at runtime. This allows efficient handling of cases where an operator might or might not be lossy.