Deserializing value should not hold the TaskSchedulerImpl lock #58
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…lerImpl lock We should not call `DirectTaskResult.value` when holding the `TaskSchedulerImpl` lock. It may cost dozens of seconds to deserialize a large object. Author: zsxwing <zsxwing@gmail.com> Closes apache#6195 from zsxwing/SPARK-7655 and squashes the following commits: 21f502e [zsxwing] Add more comments e25fa88 [zsxwing] Add comments 15010b5 [zsxwing] Deserialize value should not hold the TaskSchedulerImpl lock
|
LGTM |
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Deserializing value should not hold the TaskSchedulerImpl lock
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…conf
## What changes were proposed in this pull request?
This is an effort to reduce the difference between Hive and Spark. Spark supports case-sensitivity in columns. Especially, for Struct types, with `spark.sql.caseSensitive=true`, the following is supported.
```scala
scala> sql("select named_struct('a', 1, 'A', 2).a").show
+--------------------------+
|named_struct(a, 1, A, 2).a|
+--------------------------+
| 1|
+--------------------------+
scala> sql("select named_struct('a', 1, 'A', 2).A").show
+--------------------------+
|named_struct(a, 1, A, 2).A|
+--------------------------+
| 2|
+--------------------------+
```
And vice versa, with `spark.sql.caseSensitive=false`, the following is supported.
```scala
scala> sql("select named_struct('a', 1).A, named_struct('A', 1).a").show
+--------------------+--------------------+
|named_struct(a, 1).A|named_struct(A, 1).a|
+--------------------+--------------------+
| 1| 1|
+--------------------+--------------------+
```
However, types are considered different. For example, SET operations fail.
```scala
scala> sql("SELECT named_struct('a',1) union all (select named_struct('A',2))").show
org.apache.spark.sql.AnalysisException: Union can only be performed on tables with the compatible column types. struct<A:int> <> struct<a:int> at the first column of the second table;;
'Union
:- Project [named_struct(a, 1) AS named_struct(a, 1)alteryx#57]
: +- OneRowRelation$
+- Project [named_struct(A, 2) AS named_struct(A, 2)alteryx#58]
+- OneRowRelation$
```
This PR aims to support case-insensitive type equality. For example, in Set operation, the above operation succeed when `spark.sql.caseSensitive=false`.
```scala
scala> sql("SELECT named_struct('a',1) union all (select named_struct('A',2))").show
+------------------+
|named_struct(a, 1)|
+------------------+
| [1]|
| [2]|
+------------------+
```
## How was this patch tested?
Pass the Jenkins with a newly add test case.
Author: Dongjoon Hyun <dongjoon@apache.org>
Closes apache#18460 from dongjoon-hyun/SPARK-21247.
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SKIPME
Backport of some of the SPARK-7655 fix.