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postgresql/src/include/executor/tstoreReceiver.h

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2003-03-27 17:55:11 +01:00
/*-------------------------------------------------------------------------
*
* tstoreReceiver.h
* prototypes for tstoreReceiver.c
*
*
Update CVS HEAD for 2007 copyright. Back branches are typically not back-stamped for this.
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* Portions Copyright (c) 1996-2007, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
*
Update CVS HEAD for 2007 copyright. Back branches are typically not back-stamped for this.
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* $PostgreSQL: pgsql/src/include/executor/tstoreReceiver.h,v 1.9 2007/01/05 22:19:55 momjian Exp $
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*
*-------------------------------------------------------------------------
*/
#ifndef TSTORE_RECEIVER_H
#define TSTORE_RECEIVER_H
#include "tcop/dest.h"
Restructure command destination handling so that we pass around DestReceiver pointers instead of just CommandDest values. The DestReceiver is made at the point where the destination is selected, rather than deep inside the executor. This cleans up the original kluge implementation of tstoreReceiver.c, and makes it easy to support retrieving results from utility statements inside portals. Thus, you can now do fun things like Bind and Execute a FETCH or EXPLAIN command, and it'll all work as expected (e.g., you can Describe the portal, or use Execute's count parameter to suspend the output partway through). Implementation involves stuffing the utility command's output into a Tuplestore, which would be kind of annoying for huge output sets, but should be quite acceptable for typical uses of utility commands.
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#include "utils/tuplestore.h"
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Restructure command destination handling so that we pass around DestReceiver pointers instead of just CommandDest values. The DestReceiver is made at the point where the destination is selected, rather than deep inside the executor. This cleans up the original kluge implementation of tstoreReceiver.c, and makes it easy to support retrieving results from utility statements inside portals. Thus, you can now do fun things like Bind and Execute a FETCH or EXPLAIN command, and it'll all work as expected (e.g., you can Describe the portal, or use Execute's count parameter to suspend the output partway through). Implementation involves stuffing the utility command's output into a Tuplestore, which would be kind of annoying for huge output sets, but should be quite acceptable for typical uses of utility commands.
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extern DestReceiver *CreateTuplestoreDestReceiver(Tuplestorestate *tStore,
pgindent run.
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MemoryContext tContext);
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pgindent run.
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#endif /* TSTORE_RECEIVER_H */