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https://issues.apache.org/jira/browse/IGNITE-19307?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17723421#comment-17723421
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Maksim Zhuravkov commented on IGNITE-19307:
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This is issue is by caused by https://issues.apache.org/jira/browse/CALCITE-5130
> Sql. Set operations: Conversion to relational algebra failed to preserve
> datatypes.
> -----------------------------------------------------------------------------------
>
> Key: IGNITE-19307
> URL: https://issues.apache.org/jira/browse/IGNITE-19307
> Project: Ignite
> Issue Type: Bug
> Components: sql
> Reporter: Maksim Zhuravkov
> Priority: Minor
> Labels: ignite-3
> Fix For: 3.0.0-beta2
>
>
> The following query fails with "Conversion to relational algebra failed to
> preserve datatypes"
> {code:java}
> @Test
> public void test() {
> sql("CREATE TABLE tt (id integer primary key, test_key integer)");
> sql("INSERT INTO tt VALUES(1, 100)");
> assertQuery("SELECT test_key FROM tt UNION ALL SELECT '1000'").check();
> }
> {code}
> Although the same expression with literal works as expected:
> {code:java}
> @Test
> public void test2() {
> assertQuery("SELECT 100 UNION ALL SELECT '1000'").check();
> }
> {code}
> Error:
> {code:java}
> java.lang.AssertionError: Conversion to relational algebra failed to preserve
> datatypes:
> validated type:
> RecordType(VARCHAR CHARACTER SET "UTF-8" NOT NULL TEST_KEY) NOT NULL
> converted type:
> RecordType(VARCHAR CHARACTER SET "UTF-8" EXPR$0) NOT NULL
> rel:
> LogicalUnion(all=[true])
> LogicalProject(EXPR$0=[CAST($1):VARCHAR CHARACTER SET "UTF-8"])
> IgniteLogicalTableScan(table=[[PUBLIC, TT]])
> LogicalValues(tuples=[[{ _UTF-8'1000' }]])
> {code}
> When both side of set operation are columns query also works:
> {code:java}
> @Test
> public void test3() {
> sql("CREATE TABLE tt (id integer primary key, test_key integer)");
> sql("CREATE TABLE ttt (id integer primary key, test_key varchar)");
> sql("INSERT INTO tt VALUES(1, 100)");
> sql("INSERT INTO ttt VALUES(1, '200')");
> assertQuery("SELECT test_key FROM tt UNION ALL SELECT test_key FROM
> ttt").check();
> }
> {code}
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