[ 
https://issues.apache.org/jira/browse/IGNITE-19307?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
 ]

Maksim Zhuravkov updated IGNITE-19307:
--------------------------------------
    Environment:     (was: 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}

)

> Sql. Set operation: 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
>
>




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