elasticsearch/docs/reference/query-languages/esql/_snippets/functions/examples/to_double.md

% This is generated by ESQL's AbstractFunctionTestCase. Do no edit it. See ../README.md for how to regenerate it.

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""