Partitioner names other than CDCPartitioner are assumed to be Murmur3

[cvybhu]

PreparedStatement::set_partitioner_name is given a string with parittioner name and sets the partitioner to the right one based on this name.
Every name other than CDCPartitioner is interpreted as Murmur3Partitioner.

This is dangerous, what if someone tries using a thrid partitioner or types CDCpartitoner instead of CDCpartitioner. We will silently ignore the fact that this is an unrecogized partitioner and use Murmur3.

Maybe this function should return error when partitioner name is unknown.

scylla-rust-driver/scylla/src/statement/prepared_statement.rs

Lines 264 to 272 in 5a56e85

	/// Sets the name of the partitioner used for this statement.
	pub(crate) fn set_partitioner_name(&mut self, partitioner_name: Option<&str>) {
	self.partitioner_name = match partitioner_name {
	Some(partitioner_name) if partitioner_name.ends_with("CDCPartitioner") => {
	PartitionerName::CDC
	}
	_ => PartitionerName::Murmur3,
	}
	}

[cvybhu]

Before fixing this we should wait for #484 to be merged first. Otherwise there are gonna be merge conflicts.

[Lorak-mmk]

Now the problematic code is at

scylla-rust-driver/scylla/src/client/session.rs

Lines 1360 to 1366 in 198ca33

	// This is the first preparation that succeeded.
	// Let's return the PreparedStatement.
	prepared.set_partitioner_name(
	Self::extract_partitioner_name(&prepared, cluster_state)
	.and_then(PartitionerName::from_str)
	.unwrap_or_default(),
	);