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JSONPATH

This section contains reference documentation for the JSONPATH function.

Extracts the object value from jsonField based on 'jsonPath', the result type is inferred based on JSON value. This function can only be used in an ingestion transformation function.

Signature

JSONPATH(jsonField, 'jsonPath')

Arguments

Description

'jsonPath'` is a literal. Pinot uses single quotes to distinguish them from identifiers. You can use the Jayway JsonPath Evaluator Tool to test JSON expressions before you import any data.

Usage Examples

The usage examples are based on extracting fields from the following JSON document:

{
  "data": {
    "name": "Pete",
    "age": 24,
    "subjects": [
      {
        "name": "maths",
        "homework_grades": [80, 85, 90, 95, 100],
        "grade": "A",
        "score": 90
      },
      {
        "name": "english",
        "homework_grades": [60, 65, 70, 85, 90],
        "grade": "B",
        "score": 70
      }
    ]
  }
}

This function can be used in the table config to extract the name property into the name column and age property into the age column, as described below:

{
   "tableConfig":{
      "ingestionConfig":{
         "transformConfigs":[
            {
               "columnName":"name",
               "transformFunction":"JSONPATHSTRING(data, '$.name')"
            },
            {
               "columnName":"age",
               "transformFunction":"JSONPATHSTRING(data, '$.age')"
            }
         ]
      }
   }
}