GitHub user 10110346 opened a pull request:
https://github.com/apache/spark/pull/21957
[SPARK-24994][SQL] When the data type of the field is converted to other
types, it can also support pushdown to parquet
## What changes were proposed in this pull request?
For this statement: select * from table1 where a = 100;
the data type of `a` is `smallint` , because the defaut data type of 100 is
`int` ,so `a` is converted to `int`.
In this case, it does not support push down to parquet.
In our business, for our SQL statements, and we generally do not convert
100 to `smallint`, this pr can support push down to parquet for this situation.
## How was this patch tested?
added unit tests
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/10110346/spark otherpushdown
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/21957.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 #21957
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commit 7368d0ad9d790c589dee82d1d144d90fd1d40a70
Author: liuxian <liu.xian3@...>
Date: 2018-08-02T01:51:49Z
fix
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