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authorDongjoon Hyun <dongjoon@apache.org>2016-08-01 11:12:58 +0200
committerHerman van Hovell <hvanhovell@databricks.com>2016-08-01 11:12:58 +0200
commit64d8f37c717cbc9c1c3649cae4c7cc4e628cd72d (patch)
treeed7205b0889da4d51d7478d28cedc2beef17455c /mllib/src/test
parent579fbcf3bd9717003025caecc0c0b85bcff7ac7f (diff)
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[SPARK-16726][SQL] Improve `Union/Intersect/Except` error messages on incompatible types
## What changes were proposed in this pull request? Currently, `UNION` queries on incompatible types show misleading error messages, i.e., `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). **Before** ```scala 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; ``` **After** ```scala 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. ArrayType(IntegerType,false) <> IntegerType at the second column of the second table; 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. ArrayType(IntegerType,false) <> IntegerType at the second column of the second table; scala> sql("select 1,2,3 except (select array(1),array(2),3)") org.apache.spark.sql.AnalysisException: Except can only be performed on tables with the compatible column types. ArrayType(IntegerType,false) <> IntegerType at the first column of the second table; ``` ## How was this patch tested? Pass the Jenkins test with a new test case. Author: Dongjoon Hyun <dongjoon@apache.org> Closes #14355 from dongjoon-hyun/SPARK-16726.
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