GitHub user klinvill opened a pull request:
https://github.com/apache/spark/pull/16746
[SPARK-15648][SQL] Add teradataDialect for JDBC connection to Teradata
The contribution is my original work and I license the work to the project
under the projectâs open source license.
Note: the Teradata JDBC connector limits the row size to 64K. The default
string datatype equivalent I used is a 255 character/byte length varchar. This
effectively limits the max number of string columns to 250 when using the
Teradata jdbc connector.
## What changes were proposed in this pull request?
Added a teradataDialect for JDBC connection to Teradata. The Teradata
dialect uses VARCHAR(255) in place of TEXT for string datatypes, and CHAR(1) in
place of BIT(1) for boolean datatypes.
## How was this patch tested?
(Please explain how this patch was tested. E.g. unit tests, integration
tests, manual tests)
(If this patch involves UI changes, please attach a screenshot; otherwise,
remove this)
I added two unit tests to double check that the types get set correctly for
a teradata jdbc url. I also ran a couple manual tests to make sure the jdbc
connector worked with teradata and to make sure that an error was thrown if a
row could potentially exceed 64K (this error comes from the teradata jdbc
connector, not from the spark code). I did not check how string columns longer
than 255 characters are handled.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/klinvill/spark master
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/16746.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 #16746
----
commit 4b8d9a6d6856ed88963950921cfc64978ee2388a
Author: Kirby Linvill <[email protected]>
Date: 2017-01-26T17:47:04Z
SPARK-15648: Added teradataDialect for JDBC connection
Note: the Teradata JDBC connector limits the row size to 64K. The default
string datatype equivalent is a 255 character/byte length varchar.
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