Type	Description
BOOLEAN	Represents a boolean value in a byte. Values 0 and 1 are used to represent false and true respectively. When reading a boolean value, any non-zero value is considered true.
INT8	Represents an integer between -27 and 27-1 inclusive.
INT16	Represents an integer between -215 and 215-1 inclusive. The values are encoded using two bytes in network byte order (big-endian).
INT32	Represents an integer between -231 and 231-1 inclusive. The values are encoded using four bytes in network byte order (big-endian).
INT64	Represents an integer between -263 and 263-1 inclusive. The values are encoded using eight bytes in network byte order (big-endian).
UINT16	Represents an integer between 0 and 65535 inclusive. The values are encoded using two bytes in network byte order (big-endian).
UINT32	Represents an integer between 0 and 232-1 inclusive. The values are encoded using four bytes in network byte order (big-endian).
VARINT	Represents an integer between -231 and 231-1 inclusive. Encoding follows the variable-length zig-zag encoding from Google Protocol Buffers.
VARLONG	Represents an integer between -263 and 263-1 inclusive. Encoding follows the variable-length zig-zag encoding from Google Protocol Buffers.
UUID	Represents a type 4 immutable universally unique identifier (Uuid). The values are encoded using sixteen bytes in network byte order (big-endian).
FLOAT64	Represents a double-precision 64-bit format IEEE 754 value. The values are encoded using eight bytes in network byte order (big-endian).
STRING	Represents a sequence of characters. First the length N is given as an INT16. Then N bytes follow which are the UTF-8 encoding of the character sequence. Length must not be negative.
COMPACT_STRING	Represents a sequence of characters. First the length N + 1 is given as an UNSIGNED_VARINT . Then N bytes follow which are the UTF-8 encoding of the character sequence.
NULLABLE_STRING	Represents a sequence of characters or null. For non-null strings, first the length N is given as an INT16. Then N bytes follow which are the UTF-8 encoding of the character sequence. A null value is encoded with length of -1 and there are no following bytes.
COMPACT_NULLABLE_STRING	Represents a sequence of characters. First the length N + 1 is given as an UNSIGNED_VARINT . Then N bytes follow which are the UTF-8 encoding of the character sequence. A null string is represented with a length of 0.
BYTES	Represents a raw sequence of bytes. First the length N is given as an INT32. Then N bytes follow.
COMPACT_BYTES	Represents a raw sequence of bytes. First the length N+1 is given as an UNSIGNED_VARINT. Then N bytes follow.
NULLABLE_BYTES	Represents a raw sequence of bytes or null. For non-null values, first the length N is given as an INT32. Then N bytes follow. A null value is encoded with length of -1 and there are no following bytes.
COMPACT_NULLABLE_BYTES	Represents a raw sequence of bytes. First the length N+1 is given as an UNSIGNED_VARINT. Then N bytes follow. A null object is represented with a length of 0.
RECORDS	Represents a sequence of Kafka records as BYTES. For a detailed description of records see Message Sets.
COMPACT_RECORDS	Represents a sequence of Kafka records as COMPACT_BYTES. For a detailed description of records see Message Sets.
NULLABLE_RECORDS	Represents a sequence of Kafka records as NULLABLE_BYTES. For a detailed description of records see Message Sets.
COMPACT_NULLABLE_RECORDS	Represents a sequence of Kafka records as COMPACT_NULLABLE_BYTES. For a detailed description of records see Message Sets.
ARRAY	Represents a sequence of objects of a given type T. Type T can be either a primitive type (e.g. STRING) or a structure. First, the length N is given as an INT32. Then N instances of type T follow. In protocol documentation an array of T instances is referred to as [T].
COMPACT_ARRAY	Represents a sequence of objects of a given type T. Type T can be either a primitive type (e.g. STRING) or a structure. First, the length N + 1 is given as an UNSIGNED_VARINT. Then N instances of type T follow. In protocol documentation a compact array of T instances is referred to as (T).
NULLABLE_ARRAY	Represents a sequence of objects of a given type T. Type T can be either a primitive type (e.g. STRING) or a structure. First, the length N is given as an INT32. Then N instances of type T follow. A null array is represented with a length of -1. In protocol documentation a nullable array of T instances is referred to as ?[T].
COMPACT_NULLABLE_ARRAY	Represents a sequence of objects of a given type T. Type T can be either a primitive type (e.g. STRING) or a structure. First, the length N + 1 is given as an UNSIGNED_VARINT. Then N instances of type T follow. A null array is represented with a length of 0. In protocol documentation a compact nullable array of T instances is referred to as ?(T).
STRUCT	A struct is named by a string with a capitalized first letter and consists of one or more fields. It represents a composite object encoded as the serialization of each field in the order they are defined.In protocol documentation a struct containing multiple fields is enclosed by { and }.
NULLABLE_STRUCT	A nullable struct is named by a string with a capitalized first letter and consists of one or more fields. It represents a composite object or null. For non-null values, the first byte has value 1, followed by the serialization of each field in the order they are defined. A null value is encoded as a byte with value -1 and there are no following bytes.In protocol documentation a nullable struct containing multiple fields is enclosed by ?{ and }.