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  1. Configuration Reference
  2. Functions

jsonextractscalar

This section contains reference documentation for the JSONEXTRACTSCALAR function.

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Evaluates the 'jsonPath' on jsonField, returns the result as the type 'resultsType', use optional defaultValuefor null or parsing error.

Signature

JSONEXTRACTSCALAR(jsonField, 'jsonPath', 'resultsType', [defaultValue])

Arguments
Description

jsonField

An Identifier/Expression contains JSON documents.

'jsonPath'

'results_type'

One of the Pinot supported data types:INT, LONG, FLOAT, DOUBLE, BOOLEAN, TIMESTAMP, STRING,

INT_ARRAY, LONG_ARRAY, FLOAT_ARRAY, DOUBLE_ARRAY, STRING_ARRAY.

'jsonPath'and`` ``'results_type'are literals. Pinot uses single quotes to distinguish them from identifiers.

Usage Examples

The examples in this section are based on the . In particular we'll be querying the row WHERE id = 7044874109:

select repo
from githubEvents 
WHERE id = 7044874109
repo

{"id":115911530,"name":"LimeVista/Tapes","url":"https://api.github.com/repos/LimeVista/Tapes"}

The following examples show how to use the JSONEXTRACTSCALAR function:

select id, jsonextractscalar(repo, '$.name', 'STRING') AS name
from githubEvents 
WHERE id = 7044874109
id
name

7044874109

LimeVista/Tapes

select id, jsonextractscalar(repo, '$.foo', 'STRING') AS name
from githubEvents 
WHERE id = 7044874109
[
  {
    "message": "QueryExecutionError:\njava.lang.RuntimeException: Illegal Json Path: [$.foo], when reading [{\"id\":115911530,\"name\":\"LimeVista/Tapes\",\"url\":\"https://api.github.com/repos/LimeVista/Tapes\"}]\n\tat org.apache.pinot.core.operator.transform.function.JsonExtractScalarTransformFunction.transformToStringValuesSV(JsonExtractScalarTransformFunction.java:254)\n\tat org.apache.pinot.core.operator.docvalsets.TransformBlockValSet.getStringValuesSV(TransformBlockValSet.java:90)\n\tat org.apache.pinot.core.common.RowBasedBlockValueFetcher.createFetcher(RowBasedBlockValueFetcher.java:64)\n\tat org.apache.pinot.core.common.RowBasedBlockValueFetcher.<init>(RowBasedBlockValueFetcher.java:32)",
    "errorCode": 200
  }
]
select id, jsonextractscalar(repo, '$.foo', 'STRING', 'dummyValue') AS name
from githubEvents 
WHERE id = 7044874109
id
name

7044874109

dummyValue

Follows to read values from JSON documents.

JsonPath Syntax
Batch JSON Quick Start