GitHub user hvanhovell opened a pull request:
https://github.com/apache/spark/pull/12826
[SPARK-15047][SQL] Cleanup SQL Parser
## What changes were proposed in this pull request?
This PR addresses a few minor issues in SQL parser:
- Removes some unused rules and keywords in the grammar.
- Removes code path for fallback SQL parsing (was needed for Hive native
parsing).
- Use `UnresolvedGenerator` instead of hard-coding `Explode` & `JsonTuple`.
- Adds a more generic way of creating error messages for unsupported Hive
features.
- Use `visitFunctionName` as much as possible.
- Interpret a `CatalogColumn`'s `DataType` directly instead of parsing it
again.
## How was this patch tested?
Existing tests.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/hvanhovell/spark SPARK-15047
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/12826.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 #12826
----
commit 651a54a18a157856ba26613653c30bbd4115daa9
Author: Herman van Hovell <[email protected]>
Date: 2016-05-01T23:04:34Z
Only allow aggregated correlated scalar subqueries.
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