Jane Chan created FLINK-30282:
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Summary: Logical type ROW lost inner field's nullability after
convert to RelDataType
Key: FLINK-30282
URL: https://issues.apache.org/jira/browse/FLINK-30282
Project: Flink
Issue Type: Bug
Components: Table SQL / API
Affects Versions: 1.16.0, 1.16.1
Reporter: Jane Chan
h3. Issue History
This is not a new issue, FLINK-13604 has tracked it before, and FLINK-16344 has
also fixed it. However, the FunctionITCase added by FLINK-16344, which
validates the fix, has been removed in FLINK-16377. From that moment, there
might be some other changes happening and breaking the fix(sorry, I haven't
spent too much time digging into these changes)
h3. How to Reproduce
c.c2 lost nullability
{code:java}
Flink SQL> create table dummy (a array<int not null> not null, b array<string
not null>, c row<c1 int, c2 double not null>) with ('connector' = 'datagen');
[INFO] Execute statement succeed.
Flink SQL> desc dummy;
+------+----------------------------+-------+-----+--------+-----------+
| name | type | null | key | extras | watermark |
+------+----------------------------+-------+-----+--------+-----------+
| a | ARRAY<INT NOT NULL> | FALSE | | | |
| b | ARRAY<STRING NOT NULL> | TRUE | | | |
| c | ROW<`c1` INT, `c2` DOUBLE> | TRUE | | | |
+------+----------------------------+-------+-----+--------+-----------+
3 rows in set
{code}
h3. Reason
Two places are causing this problem in ExtendedSqlRowTypeNameSpec.
1. dt.deriveType should also pass dt's nullability as well. See
[https://github.com/apache/flink/blob/fb27e6893506006b9a3b1ac3e9b878fb6cad061a/flink-table/flink-sql-parser/src/main/java/org/apache/flink/sql/parser/type/ExtendedSqlRowTypeNameSpec.java#L159]
2. StructKind should be PEEK_FIELDS_NO_EXPAND, so that FlinkTypeFactory#
createTypeWithNullability will not fall back to super implement. See
[https://github.com/apache/flink/blob/fb27e6893506006b9a3b1ac3e9b878fb6cad061a/flink-table/flink-table-planner/src/main/scala/org/apache/flink/table/planner/calcite/FlinkTypeFactory.scala#L417]
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