Describe the bug, including details regarding any error messages, version, and platform.

according to

https://github.com/apache/calcite-avatica/blob/7b6f14c9a79ad18820482f43442e14f72566afb4/core/src/main/java/org/apache/calcite/avatica/AvaticaPreparedStatement.java#L221

it be legal to have null value in slot field.

according to the usage here

, we pass it directly.