1.6 KiB
TO_DOUBLE [esql-to_double]
Syntax
:::{image} ../../../../../images/to_double.svg :alt: Embedded :class: text-center :::
Parameters
field- Input value. The input can be a single- or multi-valued column or an expression.
Description
Converts an input value to a double value. If the input parameter is of a date type, its value will be interpreted as milliseconds since the Unix epoch, converted to double. Boolean true will be converted to double 1.0, false to 0.0.
Supported types
| field | result |
|---|---|
| boolean | double |
| counter_double | double |
| counter_integer | double |
| counter_long | double |
| date | double |
| double | double |
| integer | double |
| keyword | double |
| long | double |
| text | double |
| unsigned_long | double |
Example
ROW str1 = "5.20128E11", str2 = "foo"
| EVAL dbl = TO_DOUBLE("520128000000"), dbl1 = TO_DOUBLE(str1), dbl2 = TO_DOUBLE(str2)
| str1:keyword | str2:keyword | dbl:double | dbl1:double | dbl2:double |
|---|---|---|---|---|
| 5.20128E11 | foo | 5.20128E11 | 5.20128E11 | null |
Note that in this example, the last conversion of the string isn’t possible. When this happens, the result is a null value. In this case a Warning header is added to the response. The header will provide information on the source of the failure:
"Line 1:115: evaluation of [TO_DOUBLE(str2)] failed, treating result as null. Only first 20 failures recorded."
A following header will contain the failure reason and the offending value: "java.lang.NumberFormatException: For input string: "foo""