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f2e40380 introduces support of non-key attributes in GiST indexes. Then if get_index_column_opclass() is asked by gistproperty() to get an opclass of non-key column, it returns garbage past oidvector value. This commit fixes that by making get_index_column_opclass() return InvalidOid in this case. Discussion: https://postgr.es/m/20190902231948.GA5343%40alvherre.pgsql Author: Nikita Glukhov, Alexander Korotkov Backpatch-through: 12