1.1 KiB
1.1 KiB
COALESCE [esql-coalesce]
Syntax
:::{image} ../../../../../images/coalesce.svg :alt: Embedded :class: text-center :::
Parameters
first- Expression to evaluate.
rest- Other expression to evaluate.
Description
Returns the first of its arguments that is not null. If all arguments are null, it returns null.
Supported types
| first | rest | result |
|---|---|---|
| boolean | boolean | boolean |
| boolean | boolean | |
| cartesian_point | cartesian_point | cartesian_point |
| cartesian_shape | cartesian_shape | cartesian_shape |
| date | date | date |
| date_nanos | date_nanos | date_nanos |
| geo_point | geo_point | geo_point |
| geo_shape | geo_shape | geo_shape |
| integer | integer | integer |
| integer | integer | |
| ip | ip | ip |
| keyword | keyword | keyword |
| keyword | keyword | |
| long | long | long |
| long | long | |
| text | text | keyword |
| text | keyword | |
| version | version | version |
Example
ROW a=null, b="b"
| EVAL COALESCE(a, b)
| a:null | b:keyword | COALESCE(a, b):keyword |
|---|---|---|
| null | b | b |