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| author | Dongjoon Hyun <dongjoon@apache.org> | 2016-07-25 19:52:17 -0700 |
|---|---|---|
| committer | Reynold Xin <rxin@databricks.com> | 2016-07-25 19:52:17 -0700 |
| commit | 8a8d26f1e27db5c2228307b1c3609b4713b9d0db (patch) | |
| tree | 5c125cdb814b3b8681182e4bfda9bc228fefcfbd /sql/catalyst/src/main | |
| parent | ba0aade6d517364363e07ed09278c2b44110c33b (diff) | |
| download | spark-8a8d26f1e27db5c2228307b1c3609b4713b9d0db.tar.gz spark-8a8d26f1e27db5c2228307b1c3609b4713b9d0db.tar.bz2 spark-8a8d26f1e27db5c2228307b1c3609b4713b9d0db.zip | |
[SPARK-16672][SQL] SQLBuilder should not raise exceptions on EXISTS queries
## What changes were proposed in this pull request?
Currently, `SQLBuilder` raises `empty.reduceLeft` exceptions on *unoptimized* `EXISTS` queries. We had better prevent this.
```scala
scala> sql("CREATE TABLE t1(a int)")
scala> val df = sql("select * from t1 b where exists (select * from t1 a)")
scala> new org.apache.spark.sql.catalyst.SQLBuilder(df).toSQL
java.lang.UnsupportedOperationException: empty.reduceLeft
```
## How was this patch tested?
Pass the Jenkins tests with a new test suite.
Author: Dongjoon Hyun <dongjoon@apache.org>
Closes #14307 from dongjoon-hyun/SPARK-16672.
Diffstat (limited to 'sql/catalyst/src/main')
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