You want

@{ $self->{column} }   # Infix notation
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$self->{column}->@*    # Postfix notation
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When using the infix dereferencing syntax, the braces can only be omitted when the block amounts to a simple scalar.

@{ $ref }              # ok  Derefs $ref
@$ref                  # ok  Derefs $ref

@{ $self->{column} }   # ok  Derefs $self->{column}
@$self->{column}       # XXX Derefs $self
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See Mini-Tutorial: Dereferencing Syntax.