[jira] [Created] (SPARK-32154) Use ExpressionEncoder to serialize to catalyst type for the return type of ScalaUDF

["wuyi (Jira)" <ji...@apache.org>]

wuyi created SPARK-32154:
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             Summary: Use ExpressionEncoder to serialize to catalyst type for the return type of ScalaUDF
                 Key: SPARK-32154
                 URL: https://issues.apache.org/jira/browse/SPARK-32154
             Project: Spark
          Issue Type: Improvement
          Components: SQL
    Affects Versions: 3.1.0
            Reporter: wuyi


Users now could register a UDF with Instant/LocalDate as return type even with 

spark.sql.datetime.java8API.enabled=false. However, the UDF can only be really used with spark.sql.datetime.java8API.enabled=true. This could make users confused.

The problem is we use ExpressionEncoder to ser/deser types when registering the UDF, but use Catalyst converters to ser/deser types, which is under control of  spark.sql.datetime.java8API.enabled,  when executing UDF.

If we could also use ExpressionEncoder to ser/deser types, similar to what we do for input parameter types, the, UDF could support Instant/LocalDate, event other combined complex types as well.



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