Dongjoon Hyun created SPARK-16726:
-------------------------------------
Summary: Improve error message for `Union` queries for
incompatible types
Key: SPARK-16726
URL: https://issues.apache.org/jira/browse/SPARK-16726
Project: Spark
Issue Type: Improvement
Reporter: Dongjoon Hyun
Priority: Minor
Currently, `UNION` query on incompatible types shows a misleading error
message, e.g., `unresolved operator Union`. We had better show a more correct
message.
h4. Before
{code}
scala> sql("select 1 union (select array(1))")
org.apache.spark.sql.AnalysisException: unresolved operator 'Union;
{code}
h4. After
{code}
scala> sql("select 1 union (select array(1))")
org.apache.spark.sql.AnalysisException: Unions can only be performed on tables
with the compatible column types, but one table has '[IntegerType]' and another
table has '[ArrayType(IntegerType,false)]';
{code}
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