[jira] [Created] (FLINK-12769) Simplify expression design for symbols

[Shang Yuanchun (Jira)]

Timo Walther created FLINK-12769:
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             Summary: Simplify expression design for symbols
                 Key: FLINK-12769
                 URL: https://issues.apache.org/jira/browse/FLINK-12769
             Project: Flink
          Issue Type: New Feature
          Components: Table SQL / API
            Reporter: Timo Walther
            Assignee: Timo Walther


This task includes:
 * introduce logical type SymbolType similar to Calcite
 * remove SymbolExpression, it can be expressed using a literal



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