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Returns metadata about the columns in the query.
metadata_collection_view meta() const;
The returned collection will have as many metadata objects as columns retrieved
by the SQL query, and in the same order.
this->has_value()
== true
No-throw guarantee.
This function returns a view object, with reference semantics. The returned
view points into memory owned by *this, and will be valid as long as *this or
an object move-constructed from *this are alive.