Schemas

Iceberg tables support the following types:

Type	Description	Notes
`boolean`	True or false
`int`	32-bit signed integers	Can promote to `long`
`long`	64-bit signed integers
`float`	32-bit IEEE 754 floating point	Can promote to `double`
`double`	64-bit IEEE 754 floating point
`decimal(P,S)`	Fixed-point decimal; precision P, scale S	Scale is fixed and precision must be 38 or less
`date`	Calendar date without timezone or time
`time`	Time of day without date, timezone	Stored as microseconds
`timestamp`	Timestamp without timezone	Stored as microseconds
`timestamptz`	Timestamp with timezone	Stored as microseconds
`string`	Arbitrary-length character sequences	Encoded with UTF-8
`fixed(L)`	Fixed-length byte array of length L
`binary`	Arbitrary-length byte array
`struct<...>`	A record with named fields of any data type
`list<E>`	A list with elements of any data type
`map<K, V>`	A map with keys and values of any data type

Iceberg tracks each field in a table schema using an ID that is never reused in a table. See correctness guarantees for more information.