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https://issues.apache.org/jira/browse/CALCITE-2804?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16863235#comment-16863235
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Hongze Zhang commented on CALCITE-2804:
---------------------------------------
Hi [~jszeluga], I see there are some comments in PR haven't been addressed yet.
Since the issue might be a blocker of Calcite's next release I'd like to add
some changes on top of your work if you don't mind. (I have to open a new PR :)
)
> Druid adapter: Cast does not work 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
> Priority: Major
> Labels: pull-request-available
> Fix For: 1.20.0
>
> Time Spent: 4h
> Remaining Estimate: 0h
>
> 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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