PLS-00630: pipelined functions must have a supported collection return type
Cause: A pipelined function was specified with an unsupported return type. The following are not supported as return types of pipelined functions:

- non-collections,

- PL/SQL tables,

- associative arrays,

- collections of PL/SQL types: rowid, mlslabel, long, long raw, boolean, binary_integer, pls_integer, string and urowid The following restrictions apply:

- If the return type is a collection of records, then each of the attributes of the record must be a supported type.

- A collection of records must not contain a record type as one of its attributes.

Action: Specify a supported collection type as the pipelined function return type.
PLS-00631
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PLS-00630pipelined functions must have a supported collection return type