fengjiajie commented on PR #23478:
URL: https://github.com/apache/flink/pull/23478#issuecomment-1764364941
1. When constructing "non-comparable types," there is no problem with
`testSqlApi("NULL = f30", "NULL")`, but `testSqlApi("NULL = f30", "NULL")`
throws an exception:
```Caused by: org.apache.calcite.sql.validate.SqlValidatorException:
Cannot apply '=' to arguments of type '<NULL> =
<RECORDTYPE:PEEK_NO_EXPAND(VARCHAR(2147483647) F0, VARCHAR(2147483647) F1)>'.
Supported form(s): '<COMPARABLE_TYPE> = <COMPARABLE_TYPE>'```
2. When constructing "non-comparable types," I haven't figured out how to
cover the branch:
```} else if (isReference(right.resultType)) {``` because the preceding
```if (isReference(left.resultType)) {``` always takes precedence.
3. I have written an SQL test for MULTISET in the MiscITCase. I'm not sure
if this is appropriate.
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