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https://issues.apache.org/jira/browse/CALCITE-2346?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16496639#comment-16496639
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Marc Prud'hommeaux commented on CALCITE-2346:
---------------------------------------------
And I will lastly add that this issue can be worked around be explicitly
casting the heterogeneous columns to the same type:
{code}
0: jdbc:calcite:model=inline:{"version":1.0,"> select cast("DEPTNO" as int),
"DNAME" from "scott"."DEPT" union all select cast("department_id" as int),
"department_description" from "foodmart"."department" order by 1;
+------------+--------------------------------+
| EXPR$0 | DNAME |
+------------+--------------------------------+
| 1 | HQ General Management |
| 2 | HQ Information Systems |
| 3 | HQ Marketing |
| 4 | HQ Human Resources |
| 5 | HQ Finance and Accounting |
| 10 | ACCOUNTING |
| 11 | Store Management |
| 14 | Store Information Systems |
| 15 | Store Permanent Checkers |
| 16 | Store Temporary Checkers |
| 17 | Store Permanent Stockers |
| 18 | Store Temporary Stockers |
| 19 | Store Permanent Butchers |
| 20 | RESEARCH |
| 30 | SALES |
| 40 | OPERATIONS |
+------------+--------------------------------+
{code}
> UNION results with different column types can cause ClassCastException
> ----------------------------------------------------------------------
>
> Key: CALCITE-2346
> URL: https://issues.apache.org/jira/browse/CALCITE-2346
> Project: Calcite
> Issue Type: Bug
> Components: core
> Affects Versions: 1.16.0
> Environment: macOS 10.13.4 (17E202)
> openjdk version "10" 2018-03-20
> OpenJDK Runtime Environment 18.3 (build 10+46)
> OpenJDK 64-Bit Server VM 18.3 (build 10+46, mixed mode)
> Reporter: Marc Prud'hommeaux
> Assignee: Julian Hyde
> Priority: Minor
>
> Trying to union results from two separate data types is throwing:
> {code:java}
> java.lang.ClassCastException: java.base/java.lang.Byte cannot be cast to
> java.base/java.lang.Integer
> at
> org.apache.calcite.avatica.util.AbstractCursor$IntAccessor.getInt(AbstractCursor.java:545)
> at org.apache.calcite.avatica.AvaticaSite.get(AvaticaSite.java:339)
> at
> org.apache.calcite.avatica.AvaticaResultSet.getObject(AvaticaResultSet.java:377)
> at sqlline.Rows$Row.<init>(Rows.java:157)
> at sqlline.IncrementalRows.hasNext(IncrementalRows.java:66)
> at sqlline.TableOutputFormat.print(TableOutputFormat.java:33)
> at sqlline.SqlLine.print(SqlLine.java:1648)
> {code}
> It can reproduced with the command:
> {code:java}
> coursier launch \
> sqlline:sqlline:1.4.0 \
> org.apache.calcite:calcite-core:1.16.0 \
> org.hsqldb:hsqldb:2.4.0 \
> net.hydromatic:scott-data-hsqldb:0.1 \
> net.hydromatic:foodmart-data-hsqldb:0.4 \
> -M sqlline.SqlLine -- \
> -d org.apache.calcite.jdbc.Driver \
> -u
> 'jdbc:calcite:model=inline:{"version":1.0,"schemas":[{"name":"scott","type":"jdbc","jdbcUrl":"jdbc:hsqldb:res:scott","jdbcUser":"SCOTT","jdbcPassword":"TIGER"},{"name":"foodmart","type":"jdbc","jdbcSchema":"foodmart","jdbcUrl":"jdbc:hsqldb:res:foodmart"}]}'
>
> {code}
> The following command works fine:
> {code:java}
> 0: jdbc:calcite:model=inline:{"version":1.0,"> select "DNAME" from
> "scott"."DEPT" union all select "department_description" from
> "foodmart"."department";
> +--------------------------------+
> | DNAME |
> +--------------------------------+
> | ACCOUNTING |
> | RESEARCH |
> | SALES |
> | OPERATIONS |
> | HQ General Management |
> | HQ Information Systems |
> | HQ Marketing |
> | HQ Human Resources |
> | HQ Finance and Accounting |
> | Store Management |
> | Store Information Systems |
> | Store Permanent Checkers |
> | Store Temporary Checkers |
> | Store Permanent Stockers |
> | Store Temporary Stockers |
> | Store Permanent Butchers |
> +--------------------------------+
> 16 rows selected (0.069 seconds)
> {code}
> But when unioning two different column types:
> {code:java}
> 0: jdbc:calcite:model=inline:{"version":1.0,"> select "DEPTNO", "DNAME" from
> "scott"."DEPT" union all select "department_id", "department_description"
> from "foodmart"."department";
> +------------+--------------------------------+
> | DEPTNO | DNAME |
> +------------+--------------------------------+
> java.lang.ClassCastException: java.base/java.lang.Byte cannot be cast to
> java.base/java.lang.Integer
> at
> org.apache.calcite.avatica.util.AbstractCursor$IntAccessor.getInt(AbstractCursor.java:545)
> at org.apache.calcite.avatica.AvaticaSite.get(AvaticaSite.java:339)
> at
> org.apache.calcite.avatica.AvaticaResultSet.getObject(AvaticaResultSet.java:377)
> at sqlline.Rows$Row.<init>(Rows.java:157)
> at sqlline.IncrementalRows.hasNext(IncrementalRows.java:66)
> at sqlline.TableOutputFormat.print(TableOutputFormat.java:33)
> at sqlline.SqlLine.print(SqlLine.java:1648)
> at sqlline.Commands.execute(Commands.java:834)
> at sqlline.Commands.sql(Commands.java:733)
> at sqlline.SqlLine.dispatch(SqlLine.java:795)
> {code}
> Possibly related: https://issues.apache.org/jira/browse/CALCITE-580
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