Dongjoon Hyun created SPARK-14580:
-------------------------------------
Summary: HiveTypeCoercion.IfCoercion should preserve original
predicates.
Key: SPARK-14580
URL: https://issues.apache.org/jira/browse/SPARK-14580
Project: Spark
Issue Type: Bug
Components: SQL
Affects Versions: 1.6.1, 2.0.0
Reporter: Dongjoon Hyun
Currently, `HiveTypeCoercion.IfCoercion` removes all predicates whose
return-type is null. However, some UDFs need evaluations because they are
designed to throw exceptions.
*Hive*
{code}
hive> select if(assert_true(false),2,3);
OK
Failed with exception
java.io.IOException:org.apache.hadoop.hive.ql.metadata.HiveException:
ASSERT_TRUE(): assertion failed.
{code}
*Before*
{code}
scala> sql("select if(assert_true(false),2,3)").head
res2: org.apache.spark.sql.Row = [3]
{code}
`IfCoercion` works like the followings.
{code}
=== Applying Rule
org.apache.spark.sql.catalyst.analysis.HiveTypeCoercion$IfCoercion ===
!'Project [unresolvedalias(if
(HiveGenericUDF#org.apache.hadoop.hive.ql.udf.generic.GenericUDFAssertTrue(false))
2 else 3)] 'Project [unresolvedalias(if (nu
ll) 2 else 3)]
+- OneRowRelation$
+- OneRowRelation$
{code}
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