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Allow SQL-language functions to return the output of an INSERT/UPDATE/DELETE

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RETURNING clause, not just a SELECT as formerly.

A side effect of this patch is that when a set-returning SQL function is used
in a FROM clause, performance is improved because the output is collected into
a tuplestore within the function, rather than using the less efficient
value-per-call mechanism.
This commit is contained in:
Tom Lane
2008-10-31 19:37:56 +00:00
parent cd97f98844
commit 9b46abb7c4
11 changed files with 833 additions and 312 deletions
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9
src/backend/tcop/dest.c
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@@ -8,7 +8,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/tcop/dest.c,v 1.72 2008/01/01 19:45:52 momjian Exp $
* $PostgreSQL: pgsql/src/backend/tcop/dest.c,v 1.73 2008/10/31 19:37:56 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -32,6 +32,7 @@
#include "access/xact.h"
#include "commands/copy.h"
#include "executor/executor.h"
#include "executor/functions.h"
#include "executor/tstoreReceiver.h"
#include "libpq/libpq.h"
#include "libpq/pqformat.h"
@@ -132,6 +133,9 @@ CreateDestReceiver(CommandDest dest, Portal portal)
case DestCopyOut:
return CreateCopyDestReceiver();
case DestSQLFunction:
return CreateSQLFunctionDestReceiver();
}
/* should never get here */
@@ -158,6 +162,7 @@ EndCommand(const char *commandTag, CommandDest dest)
case DestTuplestore:
case DestIntoRel:
case DestCopyOut:
case DestSQLFunction:
break;
}
}
@@ -198,6 +203,7 @@ NullCommand(CommandDest dest)
case DestTuplestore:
case DestIntoRel:
case DestCopyOut:
case DestSQLFunction:
break;
}
}
@@ -240,6 +246,7 @@ ReadyForQuery(CommandDest dest)
case DestTuplestore:
case DestIntoRel:
case DestCopyOut:
case DestSQLFunction:
break;
}
}