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Posted to issues@spark.apache.org by "ASF GitHub Bot (Jira)" <ji...@apache.org> on 2023/10/09 18:51:00 UTC
[jira] [Updated] (SPARK-44919) Avro connector: convert a union of a single primitive type to a StructType
[ https://issues.apache.org/jira/browse/SPARK-44919?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
ASF GitHub Bot updated SPARK-44919:
-----------------------------------
Labels: pull-request-available (was: )
> Avro connector: convert a union of a single primitive type to a StructType
> --------------------------------------------------------------------------
>
> Key: SPARK-44919
> URL: https://issues.apache.org/jira/browse/SPARK-44919
> Project: Spark
> Issue Type: Improvement
> Components: Spark Core
> Affects Versions: 3.4.1
> Reporter: Tianhan Hu
> Priority: Major
> Labels: pull-request-available
>
> Spark Avro data source schema converter currently converts union with a single primitive type to a Spark primitive type instead of a StructType.
> While for more complex union types that consists of multiple primitive types, the schema converter translate them into StructTypes.
> For example,
> import scala.collection.JavaConverters._
> import org.apache.avro._
> import org.apache.spark.sql.avro._
> // ["string", "null"]
> SchemaConverters.toSqlType(
> Schema.createUnion(Seq(Schema.create(Schema.Type.STRING), Schema.create(Schema.Type.NULL)).asJava)
> ).dataType
> // ["string", "int", "null"]
> SchemaConverters.toSqlType(
> Schema.createUnion(Seq(Schema.create(Schema.Type.STRING), Schema.create(Schema.Type.INT), Schema.create(Schema.Type.NULL)).asJava)
> ).dataType
> The first one would return StringType, the second would return StructType(StringType, IntegerType).
>
> We hope to add a new configuration to control the conversion behavior. The default behavior would still be the same. When the config is altered, a union with single primitive type would be translated into StructType.
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