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This might seem minor - BUT is a BIG deal. Please consider increasing the priority - I know it is technically challenging but is a critical real-world need.
The DBMS_LOG package which has been included with Informix for many years, includes the function dbms_lob_getlength() which returns the length of a BLOB or CLOB type column. It is easy to create a function that maps the same function but is named "length" taking a CLOB or BLOB. You can enable that function by registering the excompat package in your database:
execute function sysbldprepare( 'excompat.*', 'create' );
Then:
> select dbms_lob_getlength( two ) from clob_test;
(expression)
11
And you can create the length() functions:
> create function length( blob ) returns integer
external name "$INFORMIXDIR/extend/excompat.1.0/excompat.bld(dbms_lob_getlength)" language c;
> alter function length( blob ) with (Modify External Name = "$INFORMIXDIR/extend/excompat.1.0/excompat.bld(dbms_lob_getlength)");
> create function length( clob ) returns integer
external name "$INFORMIXDIR/extend/excompat.1.0/excompat.bld(dbms_lob_getlength)" language c;
> alter function length( clob ) with (Modify External Name = "$INFORMIXDIR/extend/excompat.1.0/excompat.bld(dbms_lob_getlength)");
After which:
> select length( two ) from clob_test;
(expression)
11
1 row(s) retrieved.
Poof!
Las version 14.10.xC2 allows to cast CLOB to LVARCHAR.
I've not tested it, but maybe you can now execute
LENGTH(clob_field::LVARCHAR)
Regards,
Vicente