GitHub user dilipbiswal opened a pull request:
https://github.com/apache/spark/pull/11596
[SPARK-12719][SQL] [WIP] SQL generation support for generators, including
UDTF
## What changes were proposed in this pull request?
This is a alternate way to convert SQL from analyzed logical plans
containing Generate operator.
In this PR , generators in projection list are expressed as LATERAL VIEW.
Sample Plan :
```
GlobalLimit 3
+- LocalLimit 3
+- Project [gencol2#204]
+- Generate explode(gencol1#203), true, false, Some(gentab2),
[gencol2#204]
+- Generate explode(array(array(1, 2, 3))), true, false,
Some(gentab1), [gencol1#203]
+- MetastoreRelation default, t4, None
```
Generated Query:
```
SELECT `gentab2`.`gencol2` FROM `default`.`t4` LATERAL VIEW
explode(array(array(1, 2, 3))) `gentab1` AS `gencol1` LATERAL VIEW
explode(`gentab1`.`gencol1`) `gentab2` AS `gencol2` LIMIT 3
```
## How was this patch tested?
Tests added to LogicalPlanToSQLSuite
(If this patch involves UI changes, please attach a screenshot; otherwise,
remove this)
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/dilipbiswal/spark SPARK-12719-2
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/11596.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 #11596
----
commit fe8b0642994fd976681d7e675712738bb6f7076b
Author: Dilip Biswal <dbis...@us.ibm.com>
Date: 2016-03-05T09:49:58Z
[SPARK-13698] Fix Analysis Exceptions when Using Backticks in Generate
commit 1e9b683febba74192d5a882bcd38d0a47dd630bf
Author: Dilip Biswal <dbis...@us.ibm.com>
Date: 2016-03-07T07:42:00Z
[SPARK-12719] SQL generation support for generators (including UDTF)
commit 865f5a5afaaff2c1eb101630328c362dc63e0ddf
Author: Dilip Biswal <dbis...@us.ibm.com>
Date: 2016-03-07T21:28:48Z
Code review comments
commit c037d8ccc008bcba518a4be62da385d1fd037756
Author: Dilip Biswal <dbis...@us.ibm.com>
Date: 2016-03-08T02:36:21Z
Review comments from Reynold
commit e10883a720c7e10d5a5294093c473ff6ff358d0c
Author: Dilip Biswal <dbis...@us.ibm.com>
Date: 2016-03-08T07:35:46Z
Alternative approach.
----
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