This topic describes how to use the function in the .
The where function uses <boolean-expressions> to filter records. The where function only returns the results that evaluate to true.
Function Input/Output schema
- Function Input
- This function takes in collections of records with schema R.
- Function Output
- This function outputs collections of records with schema R.
The required syntax is in bold.
- where <boolean-expression>
- Syntax: <boolean-expression>
- Description: A scalar function that returns a boolean value. See Boolean operators.
The order in which Boolean expressions are evaluated with the
where function is:
- Expressions within parentheses
- NOT clauses
- AND clauses
- OR clauses
Examples of common use cases follow. The following examples in this section assume that you are in the SPL View.
When working in the SPL View you can write the function by providing the arguments in the exact order shown in each use case.
1. Filter for records that occur past a specific timestamp
Return records that have a timestamp greater than 1546329600 (Tuesday, 01-Jan-2019 08:00:00 GMT+0000).
...| where timestamp > 1546329600L |...;
2. Filters for records with 400, 401, 403, 404 values in the status field
Return records with 400, 401, 403, or 404 in the custom top-level
... | where status in("400", "401", "403", "404") | ...;
3. Filters out records that are null in the _value field
Returns records where the
_value is not null.
...| where _value IS NOT "null" |...;
4. Filters for records that do not match a timestamp rule
The Apply Timestamp Extraction function adds a
_rule field to the outgoing data. In order to better organize your data, you can filter for records where
_rule is equal to NULL.
...| where map_keys(_rule) IS NULL |...;
5. Filters for records with WinEventLog source_type using a regular expression
Returns records that have the source_type "WinEventLog".
...| where match_regex(source_type, /(?i)WinEventLog/) |...;
6. Filters for records with either syslog source_type or vmstat source_type
Returns records that have either syslog or vmstat as their source_type.
...| where source_type="syslog" OR source_type="vmstat" |...;
7. Returns only records where the
source_type field begins with "cisco".
You can only specify a wildcard with the where function by using the
like operator. The percent ( % ) symbol is the wildcard you must use with the like operator. The where function returns like=TRUE if the source_type field starts with the value cisco.
...| where like(source_type, "cisco%") |...;
This documentation applies to the following versions of Splunk® Data Stream Processor: 1.2.0, 1.2.1