Alessandro Solimando created HIVE-26643:
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Summary: HiveUnionPullUpConstantsRule fails when pulling up
constants over nullable fields
Key: HIVE-26643
URL: https://issues.apache.org/jira/browse/HIVE-26643
Project: Hive
Issue Type: Bug
Components: CBO
Affects Versions: 4.0.0-alpha-2
Reporter: Alessandro Solimando
Assignee: Alessandro Solimando
The rule does pull up constants without checking/adjusting nullability to match
that of the field type.
Here is the stack-trace when a nullable type is involved:
{code:java}
java.lang.AssertionError: Cannot add expression of different type to set:
set type is RecordType(JavaType(class java.lang.Integer) f1, JavaType(int) NOT
NULL f2) NOT NULL
expression type is RecordType(JavaType(int) NOT NULL f1, JavaType(int) NOT NULL
f2) NOT NULL
set is
rel#38:HiveUnion.(input#0=HepRelVertex#35,input#1=HepRelVertex#35,all=true)
expression is HiveProject(f1=[1], f2=[$0])
HiveUnion(all=[true])
HiveProject(f2=[$1])
HiveProject(f1=[$0], f2=[$1])
HiveFilter(condition=[=($0, 1)])
LogicalTableScan(table=[[]])
HiveProject(f2=[$1])
HiveProject(f1=[$0], f2=[$1])
HiveFilter(condition=[=($0, 1)])
LogicalTableScan(table=[[]])
{code}
The solution is to check nullability and add a cast when the field is nullable,
since the constant's type is not.
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