diff options
Diffstat (limited to 'src/backend/parser/analyze.c')
| -rw-r--r-- | src/backend/parser/analyze.c | 51 |
1 files changed, 50 insertions, 1 deletions
diff --git a/src/backend/parser/analyze.c b/src/backend/parser/analyze.c index 759dc64d940..4a539a1e1e8 100644 --- a/src/backend/parser/analyze.c +++ b/src/backend/parser/analyze.c @@ -17,7 +17,7 @@ * Portions Copyright (c) 1996-2008, PostgreSQL Global Development Group * Portions Copyright (c) 1994, Regents of the University of California * - * $PostgreSQL: pgsql/src/backend/parser/analyze.c,v 1.371 2008/01/01 19:45:50 momjian Exp $ + * $PostgreSQL: pgsql/src/backend/parser/analyze.c,v 1.371.2.1 2008/12/13 02:00:29 tgl Exp $ * *------------------------------------------------------------------------- */ @@ -228,6 +228,55 @@ transformStmt(ParseState *pstate, Node *parseTree) } /* + * analyze_requires_snapshot + * Returns true if a snapshot must be set before doing parse analysis + * on the given raw parse tree. + * + * Classification here should match transformStmt(). + */ +bool +analyze_requires_snapshot(Node *parseTree) +{ + bool result; + + switch (nodeTag(parseTree)) + { + /* + * Optimizable statements + */ + case T_InsertStmt: + case T_DeleteStmt: + case T_UpdateStmt: + case T_SelectStmt: + result = true; + break; + + /* + * Special cases + */ + case T_DeclareCursorStmt: + /* yes, because it's analyzed just like SELECT */ + result = true; + break; + + case T_ExplainStmt: + /* + * We only need a snapshot in varparams case, but it doesn't seem + * worth complicating this function's API to distinguish that. + */ + result = true; + break; + + default: + /* utility statements don't have any active parse analysis */ + result = false; + break; + } + + return result; +} + +/* * transformDeleteStmt - * transforms a Delete Statement */ |