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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