Tuple(T1, T2, …)

Tuples are used for temporary column grouping. Columns can be grouped when an IN expression is used in a query, and for specifying certain formal parameters of lambda functions. For more information, see the sections and Higher order functions.

You can use a function to create a tuple:

Working with data types

When creating a tuple on the fly, ClickHouse automatically detects the type of each argument as the minimum of the types which can store the argument value. If the argument is , the type of the tuple element is Nullable.