caicancai commented on PR #3909:
URL: https://github.com/apache/calcite/pull/3909#issuecomment-2276200018
```
cala> val df = spark.sql("select map_values(map(cast(null as int),0, 'foo',
1))");
df: org.apache.spark.sql.DataFrame = [map_values(map(CAST(NULL AS INT), 0,
foo, 1)): array<int>]
scala> df.show()
org.apache.spark.SparkRuntimeException: [NULL_MAP_KEY] Cannot use null as
map key.
at
org.apache.spark.sql.errors.QueryExecutionErrors$.nullAsMapKeyNotAllowedError(QueryExecutionErrors.scala:445)
```
From the spark log, the error is reported at runtime, not parameter
verification.
Similar to the previous 6400
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