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https://issues.apache.org/jira/browse/CALCITE-4897?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17450192#comment-17450192
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Julian Hyde commented on CALCITE-4897:
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Does this problem only occur with UNION and INSERT? Or (more generally) with
set operations and DML? Or are there other cases not involving set operations
or DML?
Update the summary/description to describe the scope of the problem.
> In some cases, implicit type conversion is not complete
> -------------------------------------------------------
>
> Key: CALCITE-4897
> URL: https://issues.apache.org/jira/browse/CALCITE-4897
> Project: Calcite
> Issue Type: Bug
> Components: core
> Affects Versions: 1.28.0
> Reporter: xiejiajun
> Priority: Major
> Labels: pull-request-available
> Time Spent: 1h 20m
> Remaining Estimate: 0h
>
> *case1*
> Here is the sql:
> {code:java}
> insert into t3
> select 'a', 1.0, 1 union
> select 'b', 2, 2 union
> select 'c', 3.0, CAST(3 AS SMALLINT) union
> select 'd', 4.0, 4 union
> select 'e', 5.0, 5 {code}
> but the validated sql is :
> {code:java}
> INSERT INTO `CATALOG`.`SALES`.`T3`
> SELECT 'a', CAST(1.0 AS INTEGER), CAST(1 AS SMALLINT) UNION
> SELECT 'b', 2, CAST(2 AS SMALLINT) UNION
> SELECT 'c', 3.0, CAST(3 AS SMALLINT) UNION
> SELECT 'd', 4.0, 4 UNION -- should be cast
> SELECT 'e', 5.0, 5 -- should be cast {code}
> This is why CALCITE-4458 changed '&&' to '||', the right validated sql is:
> {code:java}
> INSERT INTO `CATALOG`.`SALES`.`T3`
> SELECT 'a', CAST(1.0 AS INTEGER), CAST(1 AS SMALLINT)
> UNION
> SELECT 'b', 2, CAST(2 AS SMALLINT)
> UNION
> SELECT 'c', CAST(3.0 AS INTEGER), CAST(3 AS SMALLINT)
> UNION
> SELECT 'd', CAST(4.0 AS INTEGER), CAST(4 AS SMALLINT)
> UNION
> SELECT 'e', CAST(5.0 AS INTEGER), CAST(5 AS SMALLINT){code}
>
> *case2*
> Here is the sql
> {code:java}
> insert into t3 values
> ('a', 1.0, 1),
> ('b', 2, 2),
> ('c', 3.0, CAST(3 AS SMALLINT)),
> ('d', 4.0, 4),
> ('e', 5.0, 5){code}
> the validated sql is :
> {code:java}
> INSERT INTO `CATALOG`.`SALES`.`T3`
> VALUES ROW('a', CAST(1.0 AS INTEGER), CAST(1 AS SMALLINT)),
> ROW('b', 2, CAST(2 AS SMALLINT)),-- Encountered an integer and ended early
> ROW('c', 3.0, CAST(3 AS SMALLINT)),-- Encountered an samllint and ended early
> ROW('d', 4.0, 4),
> ROW('e', 5.0, 5) {code}
> the right validated sql is:
> {code:java}
> INSERT INTO `CATALOG`.`SALES`.`T3`
> VALUES ROW('a', CAST(1.0 AS INTEGER), CAST(1 AS SMALLINT)),
> ROW('b', 2, CAST(2 AS SMALLINT)),
> ROW('c', CAST(3.0 AS INTEGER), CAST(3 AS SMALLINT)),
> ROW('d', CAST(4.0 AS INTEGER), CAST(4 AS SMALLINT)),
> ROW('e', CAST(5.0 AS INTEGER), CAST(5 AS SMALLINT)){code}
>
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