This topic describes how to use the JSON_TUPLE function. This function retrieves the values that are represented by each path string from a JSON string.

Limits

This function is supported only in Realtime Compute for Apache Flink that uses Ververica Runtime (VVR) 3.0.0 or later.

Syntax

JSON_TUPLE(str, path1, path2 ..., pathN)

Input parameters

Parameter Data type Description
str VARCHAR The JSON string.
path1 to pathN VARCHAR A path string, which does not start with a dollar sign ($).

Example

  • Test data
    Table 1. T1
    d(VARCHAR) s(VARCHAR)
    {"qwe":"asd","qwe2":"asd2","qwe3":"asd3"} qwe3
    {"qwe":"asd4","qwe2":"asd5","qwe3":"asd3"} qwe2
  • Test statement 
    SELECT d, v 
FROM T1, lateral table(JSON_TUPLE(d, 'qwe', s))
AS T(v);
  • Test result
    d(VARCHAR) v(VARCHAR)
    {"qwe":"asd","qwe2":"asd2","qwe3":"asd3"} asd
    {"qwe":"asd","qwe2":"asd2","qwe3":"asd3"} asd3
    {"qwe":"asd4","qwe2":"asd5","qwe3":"asd3"} asd4
    {"qwe":"asd4","qwe2":"asd5","qwe3":"asd3"} asd5