2023-10-17 23:36:14 +08:00
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[discrete]
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2023-06-05 23:32:14 +08:00
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[[esql-to_long]]
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=== `TO_LONG`
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Converts an input value to a long value.
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The input can be a single- or multi-valued field or an expression. The input
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type must be of a boolean, date, string or numeric type.
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Example:
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2023-06-12 22:37:45 +08:00
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[source.merge.styled,esql]
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----
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include::{esql-specs}/ints.csv-spec[tag=to_long-str]
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----
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2023-06-12 22:37:45 +08:00
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[%header.monospaced.styled,format=dsv,separator=|]
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2023-06-05 23:32:14 +08:00
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|===
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include::{esql-specs}/ints.csv-spec[tag=to_long-str-result]
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|===
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Note that in this example, the last conversion of the string isn't
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possible. When this happens, the result is a *null* value. In this case a
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_Warning_ header is added to the response. The header will provide information
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on the source of the failure:
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`"Line 1:113: evaluation of [TO_LONG(str3)] failed, treating result as null. Only first 20 failures recorded."`
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A following header will contain the failure reason and the offending value:
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`"java.lang.NumberFormatException: For input string: \"foo\""`
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If the input parameter is of a date type, its value will be interpreted as
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milliseconds since the https://en.wikipedia.org/wiki/Unix_time[Unix epoch],
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converted to long.
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Boolean *true* will be converted to long *1*, *false* to *0*.
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