ES|QL conditional functions and expressions

Conditional functions return one of their arguments by evaluating in an if-else manner. ES|QL supports these conditional functions:

• CASE

  Returns the value for the first condition that evaluates to true.

• COALESCE

  Returns the first of its arguments that is not null.

• GREATEST

  Returns the maximum value from multiple columns.

• LEAST

  Returns the minimum value from multiple columns.

• CLAMP

  Clamps values to a specified minimum and maximum range.

• CLAMP_MIN

  Clamps input values to a lower bound, raising any value below min to min.

• CLAMP_MAX

  Clamps input values to an upper bound, reducing any value above max to max.