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https://issues.apache.org/jira/browse/SPARK-16726?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Dongjoon Hyun updated SPARK-16726:
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Description:
Currently, `UNION/INTERSECT/EXCEPT` query on incompatible types shows a
misleading error message like `unresolved operator Union`. We had better show a
more correct message. This will help users in the situation of
[SPARK-16704|https://issues.apache.org/jira/browse/SPARK-16704]
h4. Before
{code}
scala> sql("select 1,2,3 union (select 1,array(2),3)")
org.apache.spark.sql.AnalysisException: unresolved operator 'Union;
scala> sql("select 1,2,3 intersect (select 1,array(2),3)")
org.apache.spark.sql.AnalysisException: unresolved operator 'Intersect;
scala> sql("select 1,2,3 except (select 1,array(2),3)")
org.apache.spark.sql.AnalysisException: unresolved operator 'Except;
{code}
h4. After
{code}
scala> sql("select 1,2,3 union (select 1,array(2),3)")
org.apache.spark.sql.AnalysisException: Union can only be performed on tables
with the compatible column types. The first table has `[IntegerType,
IntegerType, IntegerType]` and second table has `[IntegerType,
ArrayType(IntegerType,false), IntegerType]`. The 2th column is incompatible;
scala> sql("select 1,2,3 intersect (select 1,array(2),3)")
org.apache.spark.sql.AnalysisException: Intersect can only be performed on
tables with the compatible column types. The first table has `[IntegerType,
IntegerType, IntegerType]` and second table has `[IntegerType,
ArrayType(IntegerType,false), IntegerType]`. The 2th column is incompatible;
scala> sql("select 1,2,3 except (select 1,array(2),3)")
org.apache.spark.sql.AnalysisException: Except can only be performed on tables
with the compatible column types. The first table has `[IntegerType,
IntegerType, IntegerType]` and second table has `[IntegerType,
ArrayType(IntegerType,false), IntegerType]`. The 2th column is incompatible;
{code}
was:
Currently, `UNION` query on incompatible types shows a misleading error
message, e.g., `unresolved operator Union`. We had better show a more correct
message. This will help users in the situation of
[SPARK-16704|https://issues.apache.org/jira/browse/SPARK-16704]
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}
Summary: Improve `Union/Intersect/Except` error messages on
incompatible types (was: Improve error message for `Union` queries on
incompatible types)
> Improve `Union/Intersect/Except` error messages on 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/INTERSECT/EXCEPT` query on incompatible types shows a
> misleading error message like `unresolved operator Union`. We had better show
> a more correct message. This will help users in the situation of
> [SPARK-16704|https://issues.apache.org/jira/browse/SPARK-16704]
> h4. Before
> {code}
> scala> sql("select 1,2,3 union (select 1,array(2),3)")
> org.apache.spark.sql.AnalysisException: unresolved operator 'Union;
> scala> sql("select 1,2,3 intersect (select 1,array(2),3)")
> org.apache.spark.sql.AnalysisException: unresolved operator 'Intersect;
> scala> sql("select 1,2,3 except (select 1,array(2),3)")
> org.apache.spark.sql.AnalysisException: unresolved operator 'Except;
> {code}
> h4. After
> {code}
> scala> sql("select 1,2,3 union (select 1,array(2),3)")
> org.apache.spark.sql.AnalysisException: Union can only be performed on tables
> with the compatible column types. The first table has `[IntegerType,
> IntegerType, IntegerType]` and second table has `[IntegerType,
> ArrayType(IntegerType,false), IntegerType]`. The 2th column is incompatible;
> scala> sql("select 1,2,3 intersect (select 1,array(2),3)")
> org.apache.spark.sql.AnalysisException: Intersect can only be performed on
> tables with the compatible column types. The first table has `[IntegerType,
> IntegerType, IntegerType]` and second table has `[IntegerType,
> ArrayType(IntegerType,false), IntegerType]`. The 2th column is incompatible;
> scala> sql("select 1,2,3 except (select 1,array(2),3)")
> org.apache.spark.sql.AnalysisException: Except can only be performed on
> tables with the compatible column types. The first table has `[IntegerType,
> IntegerType, IntegerType]` and second table has `[IntegerType,
> ArrayType(IntegerType,false), IntegerType]`. The 2th column is incompatible;
> {code}
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