Steven Lowenthal created CASSANDRA-5563:
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Summary: The CQL3 binary protocol does not allow a user to bind an
empty buffer to signify the start of the token range
Key: CASSANDRA-5563
URL: https://issues.apache.org/jira/browse/CASSANDRA-5563
Project: Cassandra
Issue Type: Improvement
Components: API
Affects Versions: 1.2.3
Reporter: Steven Lowenthal
Using CQL2 or CQL3 over thrift, one can issue a query which starts at the
beginning of the table by binding an empty buffer. The same is true for CQL2
using calls like get_range_slice. This is not allowed with the binary
protocol. Here is working sample code for CQL3 over thrift:
// Bind empty buffer to get query to start at the beginning of
// the table
ByteBuffer b = ByteBuffer.wrap(new byte[0]);
bindVars.add(b);
int cnt = 0;
CqlResult result;
do {
result = _client.execute_prepared_cql3_query(stmt.itemId, bindVars,
ConsistencyLevel.ONE);
// Set up the next chunk, by setting the bind var to the last received key
bindVars.set(0, ByteBuffer.wrap(result.getRows()
.get(result.getRows().size() -
1).getColumns().get(0).getValue()));
// Count rows
cnt += result.getRows().size();
if (cnt > 100)
Assert.fail("Running past the end of the table: cnt = " + cnt + ",
size() = " + result.getRows().size());
} while (result.getRows().size() >= CHUNK_SIZE);
Assert.assertEquals("Wrong count", 100, cnt);
}
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