GitHub user wangyum opened a pull request:
https://github.com/apache/spark/pull/18853
[SPARK-21646][SQL] BinaryComparison shouldn't auto cast string to int/long
## What changes were proposed in this pull request?
How to reproduce:
hive:
```:sql
$ hive -S
hive> create table spark_21646(c1 string, c2 string);
hive> insert into spark_21646 values('92233720368547758071', 'a');
hive> insert into spark_21646 values('21474836471', 'b');
hive> insert into spark_21646 values('10', 'c');
hive> select * from spark_21646 where c1 > 0;
92233720368547758071 a
10 c
21474836471 b
hive>
```
spark-sql:
```:sql
$ spark-sql -S
spark-sql> select * from spark_21646 where c1 > 0;
10 c
spark-sql> select * from spark_21646 where c1 > 0L;
21474836471 b
10 c
spark-sql> explain select * from spark_21646 where c1 > 0;
== Physical Plan ==
*Project [c1#14, c2#15]
+- *Filter (isnotnull(c1#14) && (cast(c1#14 as int) > 0))
+- *FileScan parquet spark_21646[c1#14,c2#15] Batched: true, Format:
Parquet, Location:
InMemoryFileIndex[viewfs://cluster4/user/hive/warehouse/spark_21646],
PartitionFilters: [], PushedFilters: [IsNotNull(c1)], ReadSchema:
struct<c1:string,c2:string>
spark-sql>
```
As you can see, spark auto cast c1 to int type, if this value out of
integer range, the result is different from Hive. This PR makes Literal' s type
keeps pace with AttributeReference's type.
## How was this patch tested?
unit tests
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/wangyum/spark SPARK-21646
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/18853.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 #18853
----
commit f59a213027968f5fe157376db51d0e15b68b47db
Author: Yuming Wang <[email protected]>
Date: 2017-08-05T09:20:17Z
BinaryComparison shouldn't auto cast string to int/long
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