How can a function returning character length greater than 4000 be selected in SQL

Hi,
I want to know if there is a way to write a select query on a function call which returns a varchar of more than 4000 characters.
CREATE OR REPLACE FUNCTION FUNC1
RETURN VARCHAR2
IS
str VARCHAR2(32767);
BEGIN
str := <some string greater than 4000 char>;
RETURN str;
END;
SELECT FUNC1 from dual; ---- This gives an PL/SQL numeric or value error. Character string buffer too small.
Is there any way to resolve this?
Thanks

32767 is not default. The default is still 4000 for VARCHAR2. You need to set the initialization parameter MAX_STRING_SIZE= EXTENDED for 32767.
Text from Oracle documentation
Extended Data Types
Beginning with Oracle Database 12c, you can specify a maximum size of 32767 bytes for the VARCHAR2, NVARCHAR2, and RAW data types. You can control whether your database supports this new maximum size by setting the initialization parameter MAX_STRING_SIZE as follows:
If MAX_STRING_SIZE = STANDARD, then the size limits for releases prior to Oracle Database 12c apply: 4000 bytes for the VARCHAR2 and NVARCHAR2 data types, and 2000 bytes for the RAW data type. This is the default.
If MAX_STRING_SIZE = EXTENDED, then the size limit is 32767 bytes for the VARCHAR2, NVARCHAR2, and RAW data types.

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How can a function returning character length greater than 4000 be selected in SQL

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