Github user OopsOutOfMemory commented on a diff in the pull request:
https://github.com/apache/spark/pull/2998#discussion_r19653967
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/stringOperations.scala
---
@@ -92,6 +92,29 @@ trait CaseConversionExpression {
}
}
+
+trait StringCalculationExpression {
--- End diff --
@chenghao-intel yep, what I mean is to add a trait to support return type
of Integer. Because function like LENGTH(n) which compute the size of a string
return Integer, INSTR(chr1,chr2,[n,[m]]) which compute a position also return
Integer. But I'm not sure whether this will cause some side effect or not.
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