[GitHub] [calcite] hailin0 opened a new pull request, #2855: [CALCITE-5214] Implicit type conversion fails in union sql

[GitBox]

hailin0 opened a new pull request, #2855:
URL: https://github.com/apache/calcite/pull/2855

   https://issues.apache.org/jira/browse/CALCITE-5214
   
   The following test:
   ```java
   //org.apache.calcite.test.SqlToRelConverterTest
   @Test void testUnionNullableImplicitTypeCoercion() {
     final String sql = "select id from (values(1), (null)) t (id) union select 
'varchar-id' as id";
     sql(sql).ok();
   } 
   ```
   
   Fails with the following exception:
   ```java
   Exception in thread "main" java.lang.AssertionError: Conversion to 
relational algebra failed to preserve datatypes:
   validated type:
   RecordType(VARCHAR NOT NULL ID) NOT NULL
   converted type:
   RecordType(VARCHAR EXPR$0) NOT NULL
   rel:
   LogicalUnion(all=[false])
     LogicalProject(EXPR$0=[CAST($0):VARCHAR])
       LogicalValues(tuples=[[{ 1 }, { null }]])
     LogicalValues(tuples=[[{ 'varchar-id' }]])    at 
org.apache.calcite.sql2rel.SqlToRelConverter.checkConvertedType(SqlToRelConverter.java:486)
       at 
org.apache.calcite.sql2rel.SqlToRelConverter.convertQuery(SqlToRelConverter.java:601)
       at org.apache.calcite.prepare.PlannerImpl.rel(PlannerImpl.java:259) 
   ```


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