[jira] [Created] (FLINK-8953) Resolve unresolved field references in FieldComputer expressions

[Timo Walther (JIRA)]

Timo Walther created FLINK-8953:
-----------------------------------

             Summary: Resolve unresolved field references in FieldComputer 
expressions
                 Key: FLINK-8953
                 URL: https://issues.apache.org/jira/browse/FLINK-8953
             Project: Flink
          Issue Type: Improvement
          Components: Table API & SQL
            Reporter: Timo Walther


When implementing the {{FieldComputer.getExpression}} method, it is not 
possible to use API classes but only internal expression case classes.

It would be great to also define timestamp extractors like:

{code}
  def getExpression(fieldAccesses: Array[ResolvedFieldReference]): Expression = 
{
    // 'x.cast(Types.LONG)
    // ExpressionParser.parseExpression("x.cast(LONG)")
  }
{code}



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