Simon Riggs wrote:
That sounds more like what I was after.
So let me check my understanding: For TOASTed data pg_column_size()
tells you how many bytes the column value occupies when decompressed. So
there isn't any way of finding out how many bytes a column value
actually occupies when it is both compressed and external?
I dimly recall getting confused by this when writing this guy:
From what I can see: pg_column_size calls toast_datum_size for any
variable length attribute - and then gets the external pointer and
returns its va_extsize component (which looks to me like the
*compressed* size.)
Cheers
Mark
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