GitHub user rdblue opened a pull request:
https://github.com/apache/spark/pull/21305
[SPARK-24251][SQL] Add AppendData logical plan.
## What changes were proposed in this pull request?
This adds a new logical plan, AppendData, that was proposed in SPARK-23521:
Standardize SQL logical plans.
* DataFrameWriter uses the new AppendData plan for DataSourceV2 appends
* AppendData is resolved if its output columns match the incoming data frame
* A new analyzer rule, ResolveOutputColumns, validates data before it is
appended. This rule will add safe casts, rename columns, and checks nullability
## How was this patch tested?
Existing tests for v2 appends. Will add AppendData tests to validate
logical plan analysis.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/rdblue/spark SPARK-24251-add-append-data
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/21305.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 #21305
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commit a3bf5300e4a1c9c05a50273f530eaade00d57659
Author: Ryan Blue <blue@...>
Date: 2018-05-07T15:54:37Z
SPARK-24251: Add AppendData logical plan.
This adds a new logical plan, AppendData, that was proposed in
SPARK-23521. This also adds an analyzer rule to validate data written
with AppendData against the target table. DataFrameWriter is also
updated so that v2 writes use the new AppendData logical plan.
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