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Oracle: SYS_OP functions

sys_op_* SQL functions.

`sys_op_adix`	? Compare with `optadix`
`sys_op_adt2bin`	binary representation of abstract data type (adt)?
`sys_op_atg`	Is `sys_op_atg` related to pipelined or ODCI functions? It was found in the filter of the execution plan of such a statement. Four parameters?
`sys_op_bl2r`
`sys_op_c2c`
`sys_op_cast`	? Compare with `optcast3`
`sys_op_ceg`
`sys_op_cl2c`
`sys_op_combined_hash`	See `catost.sql`
`sys_op_convert`
`sys_op_countchg`
`sys_op_csconv`
`sys_op_csconvtest`
`sys_op_csee`
`sys_op_csr`	? One parameter?
`sys_op_csx_merge`
`sys_op_csx_patch`
`sys_op_csx_upd`
`sys_op_cycled_seq`	See event 10835 (exclude `sys_op_cycled_seq` from TQ keys for scalable percentile).
`sys_op_descend`	Compare with `sys_op_undescend`
`sys_op_distinct`
`sys_op_dsb_deserialize`
`sys_op_dsb_serialize`
`sys_op_dump`	One parameter?
`sys_op_dv_check`	`sys_op_dv_check(obj_name, obj_owner)` seems to return 1 for non-sensitive columns (Database Vault protection).
`sys_op_grouping`
`sys_op_guid`
`sys_op_iix`
`sys_op_itr`
`sys_op_key_vector_create`
`sys_op_key_vector_payload`
`sys_op_key_vector_succeeded`
`sys_op_key_vector_use`
`sys_op_lbid`
`sys_op_lsvi`	?3 Parameters?
`sys_op_lvl`
`sys_op_makeoid`
`sys_op_map_nonnull`	One parameter. Returns a raw value that corresponds to the value of the parameter. If the parameter is `null`, it returns `hex(255)` which allows to compare `null` values.
`sys_op_moid`	? One parameter?
`sys_op_msr`	? One parameter?
`sys_op_mst`	? Compare with `sys_typeid`.
`sys_op_nii`
`sys_op_nix`	? Two parameters?
`sys_op_numtoraw`
`sys_op_oidvalue`	Three parameters?
`sys_op_opnsize`	Reports the number of bytes the value of a column occupies in a row.
`sys_op_par`
`sys_op_pargid`
`sys_op_part_id`
`sys_op_pivot_is`
`sys_op_pivot`
`sys_op_r2o`	One parameter. See `catvxutil.sql` etc.
`sys_op_rawtonum`	See `catxdbdl.sql`
`sys_op_rmtd`	? three parameters?
`sys_op_rpb`	One parameter?
`sys_op_tosetid`	One parameter?
`sys_op_trtb`
`sys_op_undescend`	Compare with `sys_op_descend`
`sys_op_vecand`
`sys_op_vecbit`
`sys_op_vecor`
`sys_op_vecxor`
`sys_op_version`
`sys_op_xmlcons_for_csx`
`sys_op_xpthatg`
`sys_op_xpthidx`
`sys_op_xpthop`
`sys_op_xtxt2sqlt`
`sys_op_zone_id`

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