MULTI_IF

If expr1 is TRUE, MULTI_IF returns expr2. Otherwise, it returns expr3.

tip

Before using this function, you must enable the new Databend planner. To do so, perform the following command in the SQL client:

> set enable_planner_v2=1;

Syntax

MULTI_IF( <cond1>, <expr1>, [<cond2>, <expr2> ..], <expr_else>)

Arguments

Arguments	Description
<cond_n>	The condition for evaluation that can be true or false.
<expr_n>	The expression to return if cond_n is met.
<expr_else>	The expression to return if all conditions are not met.

Return Type

The return type is determined by expr2 and expr3, they must have the lowest common type.

Examples

SET enable_planner_v2 = 1;

SELECT MULTI_IF(number=0, true, false) FROM numbers(1);
+-------------------------------+
| MULTI_IF((number = 0), true, false) |
+-------------------------------+
|                             1 |
+-------------------------------+

SELECT MULTI_IF(number % 3 = 1, 1, number % 3 = 2, 2, 3) FROM numbers(6);
+---------------------------------------------------+
| MULTI_IF(number % 3 = 1, 1, number % 3 = 2, 2, 3) |
+---------------------------------------------------+
|                                                 3 |
|                                                 1 |
|                                                 2 |
|                                                 3 |
|                                                 1 |
|                                                 2 |
+---------------------------------------------------+