GitHub user dongjoon-hyun opened a pull request:
https://github.com/apache/spark/pull/15351
[SPARK-17612][SQL] Support `DESCRIBE table PARTITION` SQL syntax
## What changes were proposed in this pull request?
This is a backport of SPARK-17612. This implements `DESCRIBE table
PARTITION` SQL Syntax again. It was supported until Spark 1.6.2, but was
dropped since 2.0.0.
**Spark 1.6.2**
```scala
scala> sql("CREATE TABLE partitioned_table (a STRING, b INT) PARTITIONED BY
(c STRING, d STRING)")
res1: org.apache.spark.sql.DataFrame = [result: string]
scala> sql("ALTER TABLE partitioned_table ADD PARTITION (c='Us', d=1)")
res2: org.apache.spark.sql.DataFrame = [result: string]
scala> sql("DESC partitioned_table PARTITION (c='Us', d=1)").show(false)
+----------------------------------------------------------------+
|result |
+----------------------------------------------------------------+
|a string |
|b int |
|c string |
|d string |
| |
|# Partition Information |
|# col_name data_type comment |
| |
|c string |
|d string |
+----------------------------------------------------------------+
```
**Spark 2.0**
- **Before**
```scala
scala> sql("CREATE TABLE partitioned_table (a STRING, b INT) PARTITIONED BY
(c STRING, d STRING)")
res0: org.apache.spark.sql.DataFrame = []
scala> sql("ALTER TABLE partitioned_table ADD PARTITION (c='Us', d=1)")
res1: org.apache.spark.sql.DataFrame = []
scala> sql("DESC partitioned_table PARTITION (c='Us', d=1)").show(false)
org.apache.spark.sql.catalyst.parser.ParseException:
Unsupported SQL statement
```
- **After**
```scala
scala> sql("CREATE TABLE partitioned_table (a STRING, b INT) PARTITIONED BY
(c STRING, d STRING)")
res0: org.apache.spark.sql.DataFrame = []
scala> sql("ALTER TABLE partitioned_table ADD PARTITION (c='Us', d=1)")
res1: org.apache.spark.sql.DataFrame = []
scala> sql("DESC partitioned_table PARTITION (c='Us', d=1)").show(false)
+-----------------------+---------+-------+
|col_name |data_type|comment|
+-----------------------+---------+-------+
|a |string |null |
|b |int |null |
|c |string |null |
|d |string |null |
|# Partition Information| | |
|# col_name |data_type|comment|
|c |string |null |
|d |string |null |
+-----------------------+---------+-------+
scala> sql("DESC EXTENDED partitioned_table PARTITION (c='Us',
d=1)").show(100,false)
+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+---------+-------+
|col_name
|data_type|comment|
+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+---------+-------+
|a
|string
|null |
|b
|int
|null |
|c
|string
|null |
|d
|string
|null |
|# Partition Information
|
| |
|# col_name
|data_type|comment|
|c
|string
|null |
|d
|string
|null |
|
|
| |
|Detailed Partition Information CatalogPartition(
Partition Values: [Us, 1]
Storage(Location:
file:/Users/dhyun/SPARK-17612-DESC-PARTITION/spark-warehouse/partitioned_table/c=Us/d=1,
InputFormat: org.apache.hadoop.mapred.TextInputFormat, OutputFormat:
org.apache.hadoop.hive.ql.io.HiveIgnoreKeyTextOutputFormat, Serde:
org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe, Properties:
[serialization.format=1])
Partition Parameters:{transient_lastDdlTime=1475001066})| |
|
+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+---------+-------+
scala> sql("DESC FORMATTED partitioned_table PARTITION (c='Us',
d=1)").show(100,false)
+--------------------------------+---------------------------------------------------------------------------------------+-------+
|col_name |data_type
|comment|
+--------------------------------+---------------------------------------------------------------------------------------+-------+
|a |string
|null |
|b |int
|null |
|c |string
|null |
|d |string
|null |
|# Partition Information |
| |
|# col_name |data_type
|comment|
|c |string
|null |
|d |string
|null |
| |
| |
|# Detailed Partition Information|
| |
|Partition Value: |[Us, 1]
| |
|Database: |default
| |
|Table: |partitioned_table
| |
|Location:
|file:/Users/dhyun/SPARK-17612-DESC-PARTITION/spark-warehouse/partitioned_table/c=Us/d=1|
|
|Partition Parameters: |
| |
| transient_lastDdlTime |1475001066
| |
| |
| |
|# Storage Information |
| |
|SerDe Library:
|org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe
| |
|InputFormat: |org.apache.hadoop.mapred.TextInputFormat
| |
|OutputFormat:
|org.apache.hadoop.hive.ql.io.HiveIgnoreKeyTextOutputFormat
| |
|Compressed: |No
| |
|Storage Desc Parameters: |
| |
| serialization.format |1
| |
+--------------------------------+---------------------------------------------------------------------------------------+-------+
```
## How was this patch tested?
Pass the Jenkins tests with a new testcase.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/dongjoon-hyun/spark SPARK-17612-BACK
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/15351.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 #15351
----
commit e5f7ced64ef23c82103bad9e86deb993e9eaed97
Author: Dongjoon Hyun <[email protected]>
Date: 2016-10-04T22:30:03Z
[SPARK-17612][SQL] Support `DESCRIBE table PARTITION` SQL syntax
----
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