PostgreSQL 7.4 Documentation
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# 39.2. Data Values in PL/Perl

The argument values supplied to a PL/Perl function's code are simply the input arguments converted to text form (just as if they had been displayed by a SELECT statement). Conversely, the return command will accept any string that is acceptable input format for the function's declared return type. So, the PL/Perl programmer can manipulate data values as if they were just text.

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