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However, thanks to schema-first approach, we can avoid sending column names with the values (serializing strings is expensive). Instead, we can write integer schema version, and then an array of values for every column in that schema.

int	Schema version
arr	Column values in schema order. nil when there is no value for a particular column.

To read or write a value for a column, we get the column type from the schema and use corresponding MsgPack data type according to Data Types Mapping above.

Code Block

language	java
title	Tuple serialization (pseudocode)

for (Column col : tuple) {
	switch (col.type().spec()) {
    	case BYTE:
        	packer.packByte(tuple.byteValue(col.name()));
	        break;
	    case SHORT:
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Handshake

Request
4 bytes	Magic number 49 47 4E 49, or "IGNI". Helps identifying misconfigured SSL or other apps probing the port.
int	Payload length
int	Version major
int	Version minor
int	Version patch
int	Client code (1 for JDBC, 2 for general-purpose client)
bin	Features (bitmask)
map (string → any)	Extensions (auth, attributes, etc). Server can skip unknown extension data (when client is newer).

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Old Version 39

New Version 40

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Handshake