Timo Walther created FLINK-12874:
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Summary: Improve the semantics of zero length character strings
Key: FLINK-12874
URL: https://issues.apache.org/jira/browse/FLINK-12874
Project: Flink
Issue Type: Sub-task
Components: Table SQL / API
Reporter: Timo Walther
Assignee: Timo Walther
Zero-length character strings need special treatment as the SQL standard
forbids to declare those type of character strings. For the type inference
(e.g. determine the return type of a \{{TRIM('')}}) it should be possible to
return zero-lengths VARCHAR types.
In any case, those type should not have a serializable string representation.
Similar behavior is done in the Oracle system: \{{SELECT DUMP(TRIM('')) AS tt
FROM dual;}} returns \{{NULL}}.
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