[HIVE-20013] Add an Implicit cast to date type for to_date function

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 4.0.0-alpha-1
• Assignee: Nishant Bangarwa
• Reporter: Nishant Bangarwa
• Created: 27/Jun/18 14:49
• Updated: 27/Feb/24 22:23
• Resolved: 27/Aug/18 09:54

Description

Issue -
SELECT TO_DATE(date1), TO_DATE(datetime1) FROM druid_table_n1;

Running this query on Druid returns null values when date1 and datetime1 are of type String.

 
INFO  : Executing command(queryId=hive_20180627144822_d4395567-e3cb-4b20-b53b-4e5eba2d7dac): EXPLAIN SELECT TO_DATE(datetime0) ,TO_DATE(date0) FROM calcs
INFO  : Starting task [Stage-1:EXPLAIN] in serial mode
INFO  : Completed executing command(queryId=hive_20180627144822_d4395567-e3cb-4b20-b53b-4e5eba2d7dac); Time taken: 0.003 seconds
INFO  : OK
+----------------------------------------------------+
|                      Explain                       |
+----------------------------------------------------+
| Plan optimized by CBO.                             |
|                                                    |
| Stage-0                                            |
|   Fetch Operator                                   |
|     limit:-1                                       |
|     Select Operator [SEL_1]                        |
|       Output:["_col0","_col1"]                     |
|       TableScan [TS_0]                             |
|         Output:["vc","vc0"],properties:{"druid.fieldNames":"vc,vc0","druid.fieldTypes":"date,date","druid.query.json":"{\"queryType\":\"scan\",\"dataSource\":\"druid_tableau.calcs\",\"intervals\":[\"1900-01-01T00:00:00.000Z/3000-01-01T00:00:00.000Z\"],\"virtualColumns\":[{\"type\":\"expression\",\"name\":\"vc\",\"expression\":\"timestamp_floor(\\\"datetime0\\\",'P1D','','UTC')\",\"outputType\":\"LONG\"},{\"type\":\"expression\",\"name\":\"vc0\",\"expression\":\"timestamp_floor(\\\"date0\\\",'P1D','','UTC')\",\"outputType\":\"LONG\"}],\"columns\":[\"vc\",\"vc0\"],\"resultFormat\":\"compactedList\"}","druid.query.type":"scan"} |
|                                                    |
+----------------------------------------------------+
10 rows selected (0.606 seconds)

Reported by dileep529