[Mono-dev] OdbcDataReader enhancement

[Ernesto]

Hi, I was taking a look at OdbcDataReader.cs and found something that 
got my attention: a call to GetSchemaTable() in the class' constructor.

The DataReader is supposed to be a very fast reader for forward-only 
queries, and getting complete schema information on every DataReader is 
a very expensive (and unsolicited) operation. The call seems completely 
unnecesary to me. Only  column information is necessary.

This patch replaces two calls to GetSchemaTable() for calls to a new 
function GetColumns().
It works perfectly in my tests and it's way much faster. Can someone 
please review and comment?

Regards,
Ernesto

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