[jira] [Created] (CALCITE-2804) Cast does not work in Druid when casting to timestamp

["Justin Szeluga (JIRA)" <ji...@apache.org>]

Justin Szeluga created CALCITE-2804:
---------------------------------------

             Summary: Cast does not work in Druid when casting to timestamp
                 Key: CALCITE-2804
                 URL: https://issues.apache.org/jira/browse/CALCITE-2804
             Project: Calcite
          Issue Type: Bug
    Affects Versions: 1.18.0
            Reporter: Justin Szeluga
            Assignee: Julian Hyde
             Fix For: 1.19.0


When trying to execute a simple statement of 
{code:java}
select cast("__time" as timestamp) from my_datasource limit 10;{code}
the query fails with a 500 error

 
{code:java}
Caused by: java.io.IOException: Server returned HTTP response code: 500 for URL: http://localhost:58082/druid/v2/?pretty
at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(Unknown Source)
at sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source)
at org.apache.calcite.runtime.HttpUtils.executeMethod(HttpUtils.java:137)
at org.apache.calcite.runtime.HttpUtils.post(HttpUtils.java:110)
at org.apache.calcite.adapter.druid.DruidConnectionImpl.request(DruidConnectionImpl.java:109)
... 29 more
{code}
because the JSON generated is incorrect. Here is the generated JSON

 

 
{code:java}
{
  "queryType": "scan",
  "dataSource": "my_datasource",
  "intervals": [
    "1900-01-01T00:00:00.000Z/3000-01-01T00:00:00.000Z"
  ],
  "virtualColumns": [
    {
      "type": "expression",
      "name": "vc",
      "expression": "timestamp_parse(timestamp_format(\"__time\",'yyyy-MM-dd\\u0027T\\u0027HH:mm:ss.SSS\\u0027Z\\u0027','America/New_York'),'','UTC')",
      "outputType": "LONG"
    }
  ],
  "columns": [
    "vc"
  ],
  "resultFormat": "compactedList",
  "limit": 10
}
{code}
There are two problems. First, the "__time" dimension is not formatted correctly in timestamp_format. The escaped quotes need to be removed.

Also, the call to timestamp_parse is incorrect. If a timezone is going to be provided then a date time format needs to be provided as well. Currently, it is only empty string

 

 



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