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https://issues.apache.org/jira/browse/CALCITE-1392?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15548495#comment-15548495
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Jesus Camacho Rodriguez commented on CALCITE-1392:
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[~julianhyde], if you did not start with it, I can tackle it to include it in
1.10.0. I think we just need to add a special case to handle column with name
"__time" when we retrieve the datasource information from Druid. This should be
fine, since "__time" is a reserved column name in Druid.
> Unable to specify time granularity for Druid
> --------------------------------------------
>
> Key: CALCITE-1392
> URL: https://issues.apache.org/jira/browse/CALCITE-1392
> Project: Calcite
> Issue Type: Bug
> Components: druid
> Affects Versions: 1.9.0
> Reporter: Maciej Bryński
> Assignee: Julian Hyde
> Fix For: 1.10.0
>
>
> Druid 0.9.1.1
> Calcite 1.9.0
> I'm trying to calculate count per day.
> What I'm doing wrong ?
> {code}
> !connect
> jdbc:calcite:schemaFactory=org.apache.calcite.adapter.druid.DruidSchemaFactory
> admin admin
> 0: jdbc:calcite:schemaFactory=org.apache.calc> !describe "table"
> +-----------+-------------+------------+-------------+-----------+-----------+-------------+---------------+----------------+----------------+----------+---------+------------+---------------+------------------+
> | TABLE_CAT | TABLE_SCHEM | TABLE_NAME | COLUMN_NAME | DATA_TYPE | TYPE_NAME
> | COLUMN_SIZE | BUFFER_LENGTH | DECIMAL_DIGITS | NUM_PREC_RADIX | NULLABLE |
> REMARKS | COLUMN_DEF | SQL_DATA_TYPE | SQL_DATETIME_SUB |
> +-----------+-------------+------------+-------------+-----------+-----------+-------------+---------------+----------------+----------------+----------+---------+------------+---------------+------------------+
> | | adhoc | table | __time | -5 | BIGINT | -1
> | | null | 10 | 1 |
> | | | |
> |
> | | adhoc | table | count | -5 | BIGINT |
> -1 | | null | 10 | 1 |
> | | |
> 0: jdbc:calcite:schemaFactory=org.apache.calc> select sum("count") from
> "table" group by floor("__time" to DAY);
> 2016-09-27 21:50:26,770 [main] ERROR -
> org.apache.calcite.sql.validate.SqlValidatorException: Cannot apply 'FLOOR'
> to arguments of type 'FLOOR(<BIGINT>, <INTERVAL DAY>)'. Supported form(s):
> 'FLOOR(<NUMERIC>)'
> 'FLOOR(<DATETIME_INTERVAL>)'
> 'FLOOR(<DATE> TO <TIME_UNIT>)'
> 'FLOOR(<TIME> TO <TIME_UNIT>)'
> 'FLOOR(<TIMESTAMP> TO <TIME_UNIT>)'
> {code}
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