GitHub user dilipbiswal opened a pull request:
https://github.com/apache/spark/pull/17636
[SPARK-20334][SQL] Return a better error message when correlated predicates
contain aggregate expression that has mixture of outer and local references.
## What changes were proposed in this pull request?
Address a follow up in
[comment](https://github.com/apache/spark/pull/16954#discussion_r105718880)
Currently subqueries with correlated predicates containing aggregate
expression having mixture of outer references and local references generate a
codegen error like following :
```SQL
SELECT t1a
FROM t1
GROUP BY 1
HAVING EXISTS (SELECT 1
FROM t2
WHERE t2a < min(t1a + t2a));
```
Exception snippet.
```
Cannot evaluate expression: min((input[0, int, false] + input[4, int,
false]))
at
org.apache.spark.sql.catalyst.expressions.Unevaluable$class.doGenCode(Expression.scala:226)
at
org.apache.spark.sql.catalyst.expressions.aggregate.AggregateExpression.doGenCode(interfaces.scala:87)
at
org.apache.spark.sql.catalyst.expressions.Expression$$anonfun$genCode$2.apply(Expression.scala:106)
at
org.apache.spark.sql.catalyst.expressions.Expression$$anonfun$genCode$2.apply(Expression.scala:103)
at scala.Option.getOrElse(Option.scala:121)
at
org.apache.spark.sql.catalyst.expressions.Expression.genCode(Expression.scala:103)
```
After this PR, a better error message is issued.
```
org.apache.spark.sql.AnalysisException
Found an aggregate expression in a correlated predicate that has both outer
and
local references, which is not supported yet.
Aggregate expression: min((t2.`t2a` + t3.`t3a`))
Outer references: t2.`t2a`
Local references: t3.`t3a`;
```
## How was this patch tested?
Added tests in SQLQueryTestSuite.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/dilipbiswal/spark subquery_followup1
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/17636.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #17636
----
commit a266c8d70df279fb079fcfde8f849dcfd6646bbc
Author: Dilip Biswal <[email protected]>
Date: 2017-03-23T06:57:12Z
[SPARK-20334] Return a better error message when correlated predicates
contain aggregate expression that has mixture of outer and local references
----
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