PostgreSQL 9.5.3 Documentation
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# 42.2. 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` and `return_next` commands will accept any string that is acceptable input format for the function's declared return type.

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PL/Perl Functions and Arguments | Up | Built-in Functions