How to extract a nested tuple field using wildcard expressions
Article ID: KB0074741
Updated On:
| Products | Versions |
|---|---|
| TIBCO Streaming | 7 |
Description
If I have a Tuple which itself contains a nested tuple, how can I emit just that nested tuple?
Issue/Introduction
The '.*' field syntax returns all fields from a nested tuple.
Resolution
For example, if you have Map "input1" with Var1(string) and Var2(SomeTuple), to emit just "SomeTuple"-fields as a non-nested tuple use a wildcard Map expression.
In a Map's StreamBase Properties view, Output Settings tab, set:
Input Fields: None
Additional Expressions:
Action: Add
Field Name: *
Expression: Var2.*
as so:
This emits all the nested fields as top-level fields.
Wildcard expansion of a tuple is described in the Help at:
TIBCO StreamBase Documentation > StreamBase References > StreamBase Expression Language Features, "Wildcards in EventFlow Expressions"
In a Map's StreamBase Properties view, Output Settings tab, set:
Input Fields: None
Additional Expressions:
Action: Add
Field Name: *
Expression: Var2.*
as so:
This emits all the nested fields as top-level fields.
Wildcard expansion of a tuple is described in the Help at:
TIBCO StreamBase Documentation > StreamBase References > StreamBase Expression Language Features, "Wildcards in EventFlow Expressions"
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