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https://issues.apache.org/jira/browse/SPARK-47670?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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ASF GitHub Bot updated SPARK-47670:
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Labels: pull-request-available (was: )
> Multiple calls to GET_JSON_OBJECT with the same JSON str should parse it just
> one time
> --------------------------------------------------------------------------------------
>
> Key: SPARK-47670
> URL: https://issues.apache.org/jira/browse/SPARK-47670
> Project: Spark
> Issue Type: Improvement
> Components: Spark Core
> Affects Versions: 3.5.2
> Reporter: Zheng Shao
> Priority: Major
> Labels: pull-request-available
>
> For a query like the following:
> {{SELECT}}
> {{ GET_JSON_OBJECT(json_col, '$.a.b'),}}
> {{ GET_JSON_OBJECT(json_col, '$.a.c')}}
> {{FROM t}}
> SparkSQL would generate a plan that parse the json_col twice.
> Ideally, SparkSQL should only parse the `json_col` once. The optimizer
> should find out the common JSON parsing, and modify the plan to parse the
> JSON once, get the result out, and flatten it back.
> An alternative way to support this is the ":" notation (JSON Path) as in
> other systems where the query optimizer will automatically share a single
> JSON parsing.
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