[CWB] [ cwb-Bugs-3208730 ] CQP: implicit expansion A^s works only once

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Bugs item #3208730, was opened at 2011-03-13 10:29
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Category: CQP engine
Group: None
Status: Open
Resolution: None
Priority: 6
Private: No
Submitted By: Stefan Evert (schtepf)
Assigned to: Stefan Evert (schtepf)
Summary: CQP: implicit expansion A^s works only once

Initial Comment:
CQP syntax allows the shorthand "A^s" for implicit expansion of a named query result to full sentences (or any other s-attribute); i.e. "A^s" should be equivalent to "A expand to s".  This has been used traditionally for subqueries in sentences containing matches of A, by activating the implicit subcorpus "A^s;".

At least in recent versions of CQP, this doesn't work as expected.  Apparently, "A^s" creates a new named query result, i.e. it is equivalent to the statement "A^s = A expand to s;".  If the named query result A is changed, the next invocation of "A^s" (either as subcorpus activation "A^s;" or in an assignment "B = A^s;") will not re-do the expansion to sentences, but access the previously stored data.

Reproducible example:

[no corpus]> DICKENS;
DICKENS> A = "things";
DICKENS> size A;
914
DICKENS> size A^s;
895
DICKENS> A = "interesting";
DICKENS> size A; 
160
DICKENS> size A^s;
895


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You can respond by visiting: 
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