[jira] [Updated] (SPARK-20193) Selecting empty struct causes ExpressionEncoder error.

2017-04-04 Thread Sean Owen (JIRA)

 [ 
https://issues.apache.org/jira/browse/SPARK-20193?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
 ]

Sean Owen updated SPARK-20193:
--
 Labels:   (was: struct)
   Priority: Minor  (was: Major)
Component/s: (was: Spark Core)
 SQL
 Documentation
 Issue Type: Improvement  (was: Bug)

This sounds like a doc issue as it's not clear that this is meaningful to 
support.

> Selecting empty struct causes ExpressionEncoder error.
> --
>
> Key: SPARK-20193
> URL: https://issues.apache.org/jira/browse/SPARK-20193
> Project: Spark
>  Issue Type: Improvement
>  Components: Documentation, SQL
>Affects Versions: 2.1.0
>Reporter: Adrian Ionescu
>Priority: Minor
>
> {{def struct(cols: Column*): Column}}
> Given the above signature and the lack of any note in the docs saying that a 
> struct with no columns is not supported, I would expect the following to work:
> {{spark.range(3).select(col("id"), struct().as("empty_struct")).collect}}
> However, this results in:
> {quote}
> java.lang.AssertionError: assertion failed: each serializer expression should 
> contains at least one `BoundReference`
>   at scala.Predef$.assert(Predef.scala:170)
>   at 
> org.apache.spark.sql.catalyst.encoders.ExpressionEncoder$$anonfun$11.apply(ExpressionEncoder.scala:240)
>   at 
> org.apache.spark.sql.catalyst.encoders.ExpressionEncoder$$anonfun$11.apply(ExpressionEncoder.scala:238)
>   at 
> scala.collection.TraversableLike$$anonfun$flatMap$1.apply(TraversableLike.scala:241)
>   at 
> scala.collection.TraversableLike$$anonfun$flatMap$1.apply(TraversableLike.scala:241)
>   at scala.collection.immutable.List.foreach(List.scala:381)
>   at scala.collection.TraversableLike$class.flatMap(TraversableLike.scala:241)
>   at scala.collection.immutable.List.flatMap(List.scala:344)
>   at 
> org.apache.spark.sql.catalyst.encoders.ExpressionEncoder.(ExpressionEncoder.scala:238)
>   at 
> org.apache.spark.sql.catalyst.encoders.RowEncoder$.apply(RowEncoder.scala:63)
>   at org.apache.spark.sql.Dataset$.ofRows(Dataset.scala:64)
>   at 
> org.apache.spark.sql.Dataset.org$apache$spark$sql$Dataset$$withPlan(Dataset.scala:2837)
>   at org.apache.spark.sql.Dataset.select(Dataset.scala:1131)
>   ... 39 elided
> {quote}



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[jira] [Updated] (SPARK-20193) Selecting empty struct causes ExpressionEncoder error.

2017-04-02 Thread Adrian Ionescu (JIRA)

 [ 
https://issues.apache.org/jira/browse/SPARK-20193?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
 ]

Adrian Ionescu updated SPARK-20193:
---
Description: 
{{def struct(cols: Column*): Column}}
Given the above signature and the lack of any note in the docs saying that a 
struct with no columns is not supported, I would expect the following to work:
{{spark.range(3).select(col("id"), struct().as("empty_struct")).collect}}

However, this results in:
{quote}
java.lang.AssertionError: assertion failed: each serializer expression should 
contains at least one `BoundReference`
  at scala.Predef$.assert(Predef.scala:170)
  at 
org.apache.spark.sql.catalyst.encoders.ExpressionEncoder$$anonfun$11.apply(ExpressionEncoder.scala:240)
  at 
org.apache.spark.sql.catalyst.encoders.ExpressionEncoder$$anonfun$11.apply(ExpressionEncoder.scala:238)
  at 
scala.collection.TraversableLike$$anonfun$flatMap$1.apply(TraversableLike.scala:241)
  at 
scala.collection.TraversableLike$$anonfun$flatMap$1.apply(TraversableLike.scala:241)
  at scala.collection.immutable.List.foreach(List.scala:381)
  at scala.collection.TraversableLike$class.flatMap(TraversableLike.scala:241)
  at scala.collection.immutable.List.flatMap(List.scala:344)
  at 
org.apache.spark.sql.catalyst.encoders.ExpressionEncoder.(ExpressionEncoder.scala:238)
  at 
org.apache.spark.sql.catalyst.encoders.RowEncoder$.apply(RowEncoder.scala:63)
  at org.apache.spark.sql.Dataset$.ofRows(Dataset.scala:64)
  at 
org.apache.spark.sql.Dataset.org$apache$spark$sql$Dataset$$withPlan(Dataset.scala:2837)
  at org.apache.spark.sql.Dataset.select(Dataset.scala:1131)
  ... 39 elided
{quote}

  was:
{{def struct(cols: Column*): Column}}
Given the above signature and the lack of any note in the docs that a struct 
with no columns is not supported, I would expect the following to work:
{{spark.range(3).select(col("id"), struct().as("empty_struct")).collect}}

However, this results in:
{quote}
java.lang.AssertionError: assertion failed: each serializer expression should 
contains at least one `BoundReference`
  at scala.Predef$.assert(Predef.scala:170)
  at 
org.apache.spark.sql.catalyst.encoders.ExpressionEncoder$$anonfun$11.apply(ExpressionEncoder.scala:240)
  at 
org.apache.spark.sql.catalyst.encoders.ExpressionEncoder$$anonfun$11.apply(ExpressionEncoder.scala:238)
  at 
scala.collection.TraversableLike$$anonfun$flatMap$1.apply(TraversableLike.scala:241)
  at 
scala.collection.TraversableLike$$anonfun$flatMap$1.apply(TraversableLike.scala:241)
  at scala.collection.immutable.List.foreach(List.scala:381)
  at scala.collection.TraversableLike$class.flatMap(TraversableLike.scala:241)
  at scala.collection.immutable.List.flatMap(List.scala:344)
  at 
org.apache.spark.sql.catalyst.encoders.ExpressionEncoder.(ExpressionEncoder.scala:238)
  at 
org.apache.spark.sql.catalyst.encoders.RowEncoder$.apply(RowEncoder.scala:63)
  at org.apache.spark.sql.Dataset$.ofRows(Dataset.scala:64)
  at 
org.apache.spark.sql.Dataset.org$apache$spark$sql$Dataset$$withPlan(Dataset.scala:2837)
  at org.apache.spark.sql.Dataset.select(Dataset.scala:1131)
  ... 39 elided
{quote}


> Selecting empty struct causes ExpressionEncoder error.
> --
>
> Key: SPARK-20193
> URL: https://issues.apache.org/jira/browse/SPARK-20193
> Project: Spark
>  Issue Type: Bug
>  Components: Spark Core
>Affects Versions: 2.1.0
>Reporter: Adrian Ionescu
>  Labels: struct
>
> {{def struct(cols: Column*): Column}}
> Given the above signature and the lack of any note in the docs saying that a 
> struct with no columns is not supported, I would expect the following to work:
> {{spark.range(3).select(col("id"), struct().as("empty_struct")).collect}}
> However, this results in:
> {quote}
> java.lang.AssertionError: assertion failed: each serializer expression should 
> contains at least one `BoundReference`
>   at scala.Predef$.assert(Predef.scala:170)
>   at 
> org.apache.spark.sql.catalyst.encoders.ExpressionEncoder$$anonfun$11.apply(ExpressionEncoder.scala:240)
>   at 
> org.apache.spark.sql.catalyst.encoders.ExpressionEncoder$$anonfun$11.apply(ExpressionEncoder.scala:238)
>   at 
> scala.collection.TraversableLike$$anonfun$flatMap$1.apply(TraversableLike.scala:241)
>   at 
> scala.collection.TraversableLike$$anonfun$flatMap$1.apply(TraversableLike.scala:241)
>   at scala.collection.immutable.List.foreach(List.scala:381)
>   at scala.collection.TraversableLike$class.flatMap(TraversableLike.scala:241)
>   at scala.collection.immutable.List.flatMap(List.scala:344)
>   at 
> org.apache.spark.sql.catalyst.encoders.ExpressionEncoder.(ExpressionEncoder.scala:238)
>   at 
> org.apache.spark.sql.catalyst.encoders.RowEncoder$.apply(RowEncoder.scala:63)
>   at org.apache.spark.sql.Dataset$.ofRows(Dataset.scala:64)
>   at 
> org.apache.spark.sql.Dataset.