Fix setting zero values on NULL (take two) about pg HOT 3 CLOSED

@vmihailenco @LK4D4 At the very least the failing build should be fixed somehow, however I'm not sure exactly which behavior you intended to implement, and therefore I'm hesitant to write any fixes myself.

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Thanks for review. In the future I will keep PR open to let you review the code.

For example, what is the difference between lines 191 and 192, if in both cases dst is of type *bool?

boolptr is nil pointer. So line 192 tests decoding NULL into nil pointer. wantnil: true means that the result should be nil pointer.

The intent of this code is not clear:

Let me try to fix it.

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In the future I will keep PR open to let you review the code.

I don't think this will be necessary in general, but please ping me in the comments if you need a review any time.

Thanks for fixing this.

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