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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