[jira] [Created] (CASSANDRA-10247) Allow both named values and regular values to simultaneously work in batches

["Michael Penick (JIRA)" <ji...@apache.org>]

Michael Penick created CASSANDRA-10247:
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             Summary: Allow both named values and regular values to simultaneously work in batches
                 Key: CASSANDRA-10247
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-10247
             Project: Cassandra
          Issue Type: Improvement
            Reporter: Michael Penick


Currently, there's a single {{<flag>}} to determine whether a batch uses named values or not. This forces all query entries in a batch to use the same value encoding. There's also the fact that the current design is broken. See: CASSANDRA-10246

I propose that this information be encoded using the batch entries {{<kind>}} component and remove "0x40: With names for values" as an option from {{<flags>}}. In the current design the {{<kind>}}, a {{[byte]}}, only uses two values 0 and 1 for non-prepared and prepared, respectively. The proposed solution would add two more values 2 and 3 for non-prepared w/ names values and prepared w/ named values. This has a couple benefits:

1) It allows for heterogeneous value encodings in a single batch
2) It eliminates the need for reading ahead to determine the value encodings (See: CASSANDRA-10246)




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