If you know you are never interested in metadata, you can omit the describe flag at all. [null indication and type specification is of course always needed to access the actual data]
More exactly they are sent separately: null indication is per row 'D'/'B' and type specification is per query 'T'.
If the client does not ask for metadata one might omit attrelid,attnum (*) and field name in the 'T' packet. One might argue whether this small win per query times column rectifies to implement the feature. But then we'd need a method to query them lateron (otherwise *DBC could never omit them at first).
Christof
*) they are not there, yet ;-)
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