wangyum opened a new pull request #24853: [WIP][SPARK-28029][SQL][TEST] Port 
int2.sql
URL: https://github.com/apache/spark/pull/24853
 
 
   ## What changes were proposed in this pull request?
   
   This PR is to port int2.sql from PostgreSQL regression tests. 
https://github.com/postgres/postgres/blob/REL_12_BETA1/src/test/regress/sql/int2.sql
   
   The expected results can be found in the link: 
https://github.com/postgres/postgres/blob/REL_12_BETA1/src/test/regress/expected/int2.out
   
   When porting the test cases, found two PostgreSQL specific features that do 
not exist in Spark SQL:
   [SPARK-28023](https://issues.apache.org/jira/browse/SPARK-28023): Trim the 
string when cast string type to other types
   [SPARK-28027](https://issues.apache.org/jira/browse/SPARK-28027): Add 
bitwise shift left/right operators
   
   Also, found a bug:
   [SPARK-28024](https://issues.apache.org/jira/browse/SPARK-28024): Incorrect 
value when out of range
   
   Also, found three inconsistent behavior:
   [SPARK-27923](https://issues.apache.org/jira/browse/SPARK-27923): Invalid 
input syntax for smallint throws exception at PostgreSQL
   [SPARK-28028](https://issues.apache.org/jira/browse/SPARK-28028): Cast 
numeric to integral type need round
   [SPARK-2659](https://issues.apache.org/jira/browse/SPARK-2659): HiveQL: 
Division operator should always perform fractional division, for example:
   ```sql
   select 1/2;
   ```
   
   ## How was this patch tested?
   
   N/A
   

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