Fixed bug #79872 by improving error message

The actual behavior here is correct, but the previous error
message was misleading, as neither fetchAll() nor buffered queries
would help

Fixed bug #79872 by improving error message

The actual behavior here is correct, but the previous error
message was misleading, as neither fetchAll() nor buffered queries
would help in this situation. Instead it is necessary to consume
all rowsets, which can be done by either unsetting the statement
or calling closeCursor().

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