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| author | Tom Lane <tgl@sss.pgh.pa.us> | 2016-08-16 20:33:01 -0400 |
|---|---|---|
| committer | Tom Lane <tgl@sss.pgh.pa.us> | 2016-08-16 20:33:01 -0400 |
| commit | 0bb51aa96783e8a6c473c2b5e3725e23e95db834 (patch) | |
| tree | f4d4077257f5a4937fefafd0fe6f914f5e4027fd /src/backend/nodes/readfuncs.c | |
| parent | 4bc4cfe3bd186b4a1d1b01279bfd0e6ab11268b2 (diff) | |
| download | postgresql-0bb51aa96783e8a6c473c2b5e3725e23e95db834.tar.gz postgresql-0bb51aa96783e8a6c473c2b5e3725e23e95db834.zip | |
Improve parsetree representation of special functions such as CURRENT_DATE.
We implement a dozen or so parameterless functions that the SQL standard
defines special syntax for. Up to now, that was done by converting them
into more or less ad-hoc constructs such as "'now'::text::date". That's
messy for multiple reasons: it exposes what should be implementation
details to users, and performance is worse than it needs to be in several
cases. To improve matters, invent a new expression node type
SQLValueFunction that can represent any of these parameterless functions.
Bump catversion because this changes stored parsetrees for rules.
Discussion: <30058.1463091294@sss.pgh.pa.us>
Diffstat (limited to 'src/backend/nodes/readfuncs.c')
| -rw-r--r-- | src/backend/nodes/readfuncs.c | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/src/backend/nodes/readfuncs.c b/src/backend/nodes/readfuncs.c index 94954dcc722..c83063e2197 100644 --- a/src/backend/nodes/readfuncs.c +++ b/src/backend/nodes/readfuncs.c @@ -1042,6 +1042,22 @@ _readMinMaxExpr(void) } /* + * _readSQLValueFunction + */ +static SQLValueFunction * +_readSQLValueFunction(void) +{ + READ_LOCALS(SQLValueFunction); + + READ_ENUM_FIELD(op, SQLValueFunctionOp); + READ_OID_FIELD(type); + READ_INT_FIELD(typmod); + READ_LOCATION_FIELD(location); + + READ_DONE(); +} + +/* * _readXmlExpr */ static XmlExpr * @@ -2348,6 +2364,8 @@ parseNodeString(void) return_value = _readCoalesceExpr(); else if (MATCH("MINMAX", 6)) return_value = _readMinMaxExpr(); + else if (MATCH("SQLVALUEFUNCTION", 16)) + return_value = _readSQLValueFunction(); else if (MATCH("XMLEXPR", 7)) return_value = _readXmlExpr(); else if (MATCH("NULLTEST", 8)) |