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| ## PPL `fillnull` command | ||
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| ### Description | ||
| Using ``fillnull`` command to fill null with provided value in one or more fields in the search result. | ||
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| ### Syntax | ||
| `fillnull [with <null-replacement> in <nullable-field>["," <nullable-field>]] | [using <source-field> = <null-replacement> [","<source-field> = <null-replacement>]]` | ||
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| * null-replacement: mandatory. The value used to replace `null`s. | ||
| * nullable-field: mandatory. Field reference. The `null` values in the field referred to by the property will be replaced with the values from the null-replacement. | ||
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| ### Example 1: fillnull one field | ||
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| The example show fillnull one field. | ||
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| PPL query: | ||
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| os> source=logs | fields status_code | eval input=status_code | fillnull value = 0 status_code; | ||
| | input | status_code | | ||
| |-------|-------------| | ||
| | 403 | 403 | | ||
| | 403 | 403 | | ||
| | NULL | 0 | | ||
| | NULL | 0 | | ||
| | 200 | 200 | | ||
| | 404 | 404 | | ||
| | 500 | 500 | | ||
| | NULL | 0 | | ||
| | 500 | 500 | | ||
| | 404 | 404 | | ||
| | 200 | 200 | | ||
| | 500 | 500 | | ||
| | NULL | 0 | | ||
| | NULL | 0 | | ||
| | 404 | 404 | | ||
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| ### Example 2: fillnull applied to multiple fields | ||
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| The example show fillnull applied to multiple fields. | ||
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| PPL query: | ||
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| os> source=logs | fields request_path, timestamp | eval input_request_path=request_path, input_timestamp = timestamp | fillnull value = '???' request_path, timestamp; | ||
| | input_request_path | input_timestamp | request_path | timestamp | | ||
| |--------------------|-----------------------|--------------|------------------------| | ||
| | /contact | NULL | /contact | ??? | | ||
| | /home | NULL | /home | ??? | | ||
| | /about | 2023-10-01 10:30:00 | /about | 2023-10-01 10:30:00 | | ||
| | /home | 2023-10-01 10:15:00 | /home | 2023-10-01 10:15:00 | | ||
| | NULL | 2023-10-01 10:20:00 | ??? | 2023-10-01 10:20:00 | | ||
| | NULL | 2023-10-01 11:05:00 | ??? | 2023-10-01 11:05:00 | | ||
| | /about | NULL | /about | ??? | | ||
| | /home | 2023-10-01 10:00:00 | /home | 2023-10-01 10:00:00 | | ||
| | /contact | NULL | /contact | ??? | | ||
| | NULL | 2023-10-01 10:05:00 | ??? | 2023-10-01 10:05:00 | | ||
| | NULL | 2023-10-01 10:50:00 | ??? | 2023-10-01 10:50:00 | | ||
| | /services | NULL | /services | ??? | | ||
| | /home | 2023-10-01 10:45:00 | /home | 2023-10-01 10:45:00 | | ||
| | /services | 2023-10-01 11:00:00 | /services | 2023-10-01 11:00:00 | | ||
| | NULL | 2023-10-01 10:35:00 | ??? | 2023-10-01 10:35:00 | | ||
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| ### Example 3: fillnull applied to multiple fields with various `null` replacement values | ||
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| The example show fillnull with various values used to replace `null`s. | ||
| - `/error` in `request_path` field | ||
| - `1970-01-01 00:00:00` in `timestamp` field | ||
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| PPL query: | ||
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| os> source=logs | fields request_path, timestamp | eval input_request_path=request_path, input_timestamp = timestamp | fillnull using request_path = '/error', timestamp='1970-01-01 00:00:00'; | ||
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| | input_request_path | input_timestamp | request_path | timestamp | | ||
| |--------------------|-----------------------|--------------|------------------------| | ||
| | /contact | NULL | /contact | 1970-01-01 00:00:00 | | ||
| | /home | NULL | /home | 1970-01-01 00:00:00 | | ||
| | /about | 2023-10-01 10:30:00 | /about | 2023-10-01 10:30:00 | | ||
| | /home | 2023-10-01 10:15:00 | /home | 2023-10-01 10:15:00 | | ||
| | NULL | 2023-10-01 10:20:00 | /error | 2023-10-01 10:20:00 | | ||
| | NULL | 2023-10-01 11:05:00 | /error | 2023-10-01 11:05:00 | | ||
| | /about | NULL | /about | 1970-01-01 00:00:00 | | ||
| | /home | 2023-10-01 10:00:00 | /home | 2023-10-01 10:00:00 | | ||
| | /contact | NULL | /contact | 1970-01-01 00:00:00 | | ||
| | NULL | 2023-10-01 10:05:00 | /error | 2023-10-01 10:05:00 | | ||
| | NULL | 2023-10-01 10:50:00 | /error | 2023-10-01 10:50:00 | | ||
| | /services | NULL | /services | 1970-01-01 00:00:00 | | ||
| | /home | 2023-10-01 10:45:00 | /home | 2023-10-01 10:45:00 | | ||
| | /services | 2023-10-01 11:00:00 | /services | 2023-10-01 11:00:00 | | ||
| | NULL | 2023-10-01 10:35:00 | /error | 2023-10-01 10:35:00 | |