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https://issues.apache.org/jira/browse/SPARK-36986?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Rodrigo Boavida updated SPARK-36986:
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Docs Text:
Schema management improvements
1 - Retrieving a field name and type from a schema based on its index
was:
Schema management improvements
1 - Retrieving a field name and type from a schema based on its index
2 - Allowing external dataSet schemas to be provided as well their external
generated rows.
> Improving external schema management flexibility
> ------------------------------------------------
>
> Key: SPARK-36986
> URL: https://issues.apache.org/jira/browse/SPARK-36986
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 3.3.0
> Reporter: Rodrigo Boavida
> Priority: Major
>
> Our spark usage, requires us to build an external schema and pass it on while
> creating a DataSet.
> While working through this, I found a couple of optimizations would improve
> greatly Spark's flexibility to handle external schema management.
> Scope: ability to retrieve a field's name and schema in one single call,
> requesting to return a tupple by index.
> Means extending the StructType class to support an additional method
> This is what the function would look like:
> /**
> * Returns the index and field structure by name.
> * If it doesn't find it, returns None.
> * Avoids two client calls/loops to obtain consolidated field info.
> *
> */
> def getIndexAndFieldByName(name: String): Option[(Int, StructField)] = \{
> val field = nameToField.get(name) if(field.isDefined) \{
> Some((fieldIndex(name), field.get)) }
> else
> { None }
> }
> This is particularly useful from an efficiency perspective, when we're
> parsing a Json structure and we want to check for every field what is the
> name and field type already defined in the schema
> I will create a corresponding branch for PR review, assuming that there are
> no concerns with the above proposal.
>
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