wangyum commented on issue #27518: [SPARK-30768][SQL] Constraints should be 
inferred from inequality attributes
URL: https://github.com/apache/spark/pull/27518#issuecomment-585189218
 
 
   @peter-toth I'd like to handle another case in this PR:
   ```scala
   spark.sql("CREATE TABLE `dw_user_state_history` (`id` DECIMAL(18,0), 
`change_time` date, `to_state` DECIMAL(9,0)) USING parquet")
   
   spark.sql("CREATE TABLE `dw_user_cntry_hist` (`user_id` DECIMAL(18,0), 
`start_dt` DATE, `end_dt` DATE) USING parquet")
   
   spark.sql(
     """
       |SELECT
       |         count(*)
       |FROM
       |         dw_user_state_history ush
       |         INNER JOIN dw_user_cntry_hist uch ON (uch.user_id = ush.id AND 
CAST(ush.change_time AS date) >= uch.start_dt AND CAST(ush.change_time AS date) 
< uch.end_dt)
       |WHERE
       |         change_time between '2019-07-01 00:00:00' AND '2019-07-02 
00:00:00'
       |""".stripMargin).explain()
   ```
   The exepected physical plan:
   ```
   == Physical Plan ==
   *(3) HashAggregate(keys=[], functions=[count(1)])
   +- Exchange SinglePartition, true, [id=#139]
      +- *(2) HashAggregate(keys=[], functions=[partial_count(1)])
         +- *(2) Project
            +- *(2) BroadcastHashJoin [id#219], [user_id#222], Inner, 
BuildRight, ((change_time#220 >= start_dt#223) AND (change_time#220 < 
end_dt#224))
               :- *(2) Project [id#219, change_time#220]
               :  +- *(2) Filter (((isnotnull(change_time#220) AND 
(change_time#220 >= 18078)) AND (change_time#220 <= 18079)) AND 
isnotnull(id#219))
               :     +- *(2) ColumnarToRow
               :        +- FileScan parquet 
default.dw_user_state_history[id#219,change_time#220] Batched: true, 
DataFilters: [isnotnull(change_time#220), (change_time#220 >= 18078), 
(change_time#220 <= 18079), isnotnull(id..., Format: Parquet, Location: 
InMemoryFileIndex[file:/Users/yumwang/opensource/spark/sql/core/spark-warehouse/org.apache.spark....,
 PartitionFilters: [], PushedFilters: [IsNotNull(change_time), 
GreaterThanOrEqual(change_time,2019-07-01), LessThanOrEqual(change_time,..., 
ReadSchema: struct<id:decimal(18,0),change_time:date>
               +- BroadcastExchange HashedRelationBroadcastMode(List(input[0, 
decimal(18,0), true])), [id=#133]
                  +- *(1) Project [user_id#222, start_dt#223, end_dt#224]
                     +- *(1) Filter (((((isnotnull(end_dt#224) AND 
(start_dt#223 <= 18079)) AND isnotnull(user_id#222)) AND (start_dt#223 < 
end_dt#224)) AND isnotnull(start_dt#223)) AND (end_dt#224 > 18078))
                        +- *(1) ColumnarToRow
                           +- FileScan parquet 
default.dw_user_cntry_hist[user_id#222,start_dt#223,end_dt#224] Batched: true, 
DataFilters: [isnotnull(end_dt#224), (start_dt#223 <= 18079), 
isnotnull(user_id#222), (start_dt#223 < end_dt#2..., Format: Parquet, Location: 
InMemoryFileIndex[file:/Users/yumwang/opensource/spark/sql/core/spark-warehouse/org.apache.spark....,
 PartitionFilters: [], PushedFilters: [IsNotNull(end_dt), 
LessThanOrEqual(start_dt,2019-07-02), IsNotNull(user_id), 
IsNotNull(start_dt)..., ReadSchema: 
struct<user_id:decimal(18,0),start_dt:date,end_dt:date>
   
   ```

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