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4 | 4 | *Generic trigger procedures for referential integrity constraint |
5 | 5 | *checks. |
6 | 6 | * |
7 | | - *1999 Jan Wieck |
| 7 | + *Note about memory management: the private hashtables kept here live |
| 8 | + *across query and transaction boundaries, in fact they live as long as |
| 9 | + *the backend does. This works because the hashtable structures |
| 10 | + *themselves are allocated by dynahash.c in its permanent DynaHashCxt, |
| 11 | + *and the parse/plan node trees they point to are copied into |
| 12 | + *TopMemoryContext using SPI_saveplan(). This is pretty ugly, since there |
| 13 | + *is no way to free a no-longer-needed plan tree, but then again we don't |
| 14 | + *yet have any bookkeeping that would allow us to detect that a plan isn't |
| 15 | + *needed anymore. Improve it someday. |
8 | 16 | * |
9 | | - * $Header: /cvsroot/pgsql/src/backend/utils/adt/ri_triggers.c,v 1.20 2000/12/22 18:35:09 tgl Exp $ |
| 17 | + * |
| 18 | + * Portions Copyright (c) 2000-2001, PostgreSQL Global Development Group |
| 19 | + * Copyright 1999 Jan Wieck |
| 20 | + * |
| 21 | + * $Header: /cvsroot/pgsql/src/backend/utils/adt/ri_triggers.c,v 1.21 2001/02/15 21:57:43 tgl Exp $ |
10 | 22 | * |
11 | 23 | * ---------- |
12 | 24 | */ |
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