mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-11-18 21:51:57 +00:00
19 lines
845 B
Markdown
19 lines
845 B
Markdown
# Functions for implementing the IN operator
|
|
|
|
## in, notIn, globalIn, globalNotIn
|
|
|
|
See the section "IN operators".
|
|
|
|
## tuple(x, y, ...), operator (x, y, ...)
|
|
|
|
A function that allows grouping multiple columns.
|
|
For columns with the types T1, T2, ..., it returns a Tuple(T1, T2, ...) type tuple containing these columns. There is no cost to execute the function.
|
|
Tuples are normally used as intermediate values for an argument of IN operators, or for creating a list of formal parameters of lambda functions. Tuples can't be written to a table.
|
|
|
|
## tupleElement(tuple, n), operator x.N
|
|
|
|
A function that allows getting a column from a tuple.
|
|
'N' is the column index, starting from 1. N must be a constant. 'N' must be a constant. 'N' must be a strict postive integer no greater than the size of the tuple.
|
|
There is no cost to execute the function.
|
|
|