[jira] [Created] (FLINK-7137) Flink table API defaults top level fields as nullable and all nested fields within CompositeType as non-nullable

["Rong Rong (JIRA)" <ji...@apache.org>]

Rong Rong created FLINK-7137:
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             Summary: Flink table API defaults top level fields as nullable and all nested fields within CompositeType as non-nullable
                 Key: FLINK-7137
                 URL: https://issues.apache.org/jira/browse/FLINK-7137
             Project: Flink
          Issue Type: Bug
    Affects Versions: 1.3.1
            Reporter: Rong Rong


Right now FlinkTypeFactory does conversion between Flink TypeInformation to Calcite RelDataType by assuming the following: 

All top level fields will be set to nullable and all nested fields within CompositeRelDataType and GenericRelDataType will be set to Calcite default (which is non-nullable). 

This triggers Calcite SQL optimization engine drop all `IS NOT NULL` clause on nested fields, and would not be able to optimize when top level fields were actually non-nullable.





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