jsonextractscalar
This section contains reference documentation for the JSONEXTRACTSCALAR function.
Evaluates the 'jsonPath' on jsonField, returns the result as the type 'resultsType', use optional defaultValuefor null or parsing error.
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.The examples in this section are based on the Batch JSON Quick Start. 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 |
Last modified 1yr ago